Injection assembly of a die-casting apparatus

Abstract

The application discloses a kind of injection assembly of die casting equipment, belongs to die casting forming technical field.Along with the problems such as long axial injection stroke, easy thermal deformation, high machining precision and easy wear, the technical scheme of the application is as follows:an injection assembly of die casting equipment, comprising a pressure chamber and at least one injection execution structure;The injection execution structure moves in the direction perpendicular to the mold pouring system axis to push the melt in the pressure chamber into the mold cavity.By changing the direction of the soup injection movement, the effective cross-sectional area of the pressure chamber can be substantially increased, and the filling speed can be significantly improved at the same punch injection speed.This injection assembly can easily contain a sub-chamber to simultaneously provide the functions of pressure boosting and defect compensation, shorten the injection stroke, and reduce equipment manufacturing costs, punch and barrel wear, improve service life, and simplify maintenance, etc.Advantages.

Description

Technical Field

[0001] This invention belongs to the field of die casting technology, and specifically relates to an injection component of a die casting equipment. Background Technology

[0002] Die casting is a process in which molten metal is injected into a pressure chamber, and the mold cavity is filled and cooled under pressure.

[0003] Traditional equipment generally adopts an axial filling structure, with its injection punch having a cylindrical design that moves linearly along the axis of the pressure chamber. When the force applied to the injection punch is constant, in order to increase the casting pressure, the diameter of the punch and the pressure chamber must be reduced, which directly leads to an increase in the length of the pressure chamber and a significant increase in the injection stroke.

[0004] This type of structure presents multiple technical bottlenecks: to ensure the molten metal fills the cavity before solidification, the punch needs to operate at extremely high speeds, placing stringent demands on the drive system and control precision. This necessitates the additional configuration of a high-speed accumulator, resulting in high equipment manufacturing costs. Simultaneously, the excessively long fit between the pressure chamber and the punch is prone to bending deformation or uneven stress distribution under high temperature and pressure conditions. This can easily lead to direct interference between the punch and the pressure chamber wall during reciprocating motion, accelerating wear on both surfaces and potentially causing direct damage, severely shortening the equipment's lifespan. Furthermore, maintaining the fit precision of the long-stroke structure is extremely difficult, significantly increasing the complexity of manufacturing and daily maintenance, thereby interfering with the stability of casting quality and the continuity of the production process. These shortcomings collectively restrict the efficiency improvement and application expansion of the die-casting process. Summary of the Invention

[0005] The present invention provides an injection assembly for a die casting molding apparatus to solve at least one of the above-mentioned technical problems.

[0006] The technical solution adopted in this invention is as follows: An injection assembly for a die-casting molding equipment includes a pressure chamber and an injection execution structure, wherein the injection execution structure includes at least one injection execution unit. The injection unit moves in a direction perpendicular to the axis of the mold gating system to push the molten liquid in the pressure chamber into the mold cavity; The effective working cross-sectional area of ​​the injection actuator is larger than that of a traditional cylindrical injection punch for the same die-casting machine tonnage, so as to increase the filling flow rate and shorten the injection stroke and time at the same movement speed.

[0007] Furthermore, this application also proposes that the injection execution unit is a block-shaped, plate-shaped, or columnar structure with a rectangular, circular, or irregular polygonal cross-section.

[0008] Furthermore, this application also proposes that the injection execution structure includes two independent injection execution units, the height and width of which are respectively... H i , W i Two injection units move synchronously in parallel along the same or opposite directions, with a molten volume DV filling the mold per unit time. H 1 W 1 v 1 + H 2 W 2 v 2 ,in v 1 and v 2 These represent the movement speeds of the two injection blocks in the injection execution unit.

[0009] Furthermore, this application also proposes that the cross-sectional area of ​​one of the said injection actuators... H 1 ×W 1 It has a smaller cross-sectional area than another injection unit and is used to implement pressurization, pressure holding, and fill-in functions.

[0010] Furthermore, this application also proposes that the injection execution unit includes a large injection block and a small injection block, which can slide relative to each other along the same direction of movement; the large injection block is used for rapid filling, and the small injection block is used for pressurization, pressure holding and defect filling.

[0011] Furthermore, this application also proposes that a detachable connection device be provided between the large injection block and the small injection block, and the connection between the large injection block and the small injection block be released after the large injection block reaches the end of its stroke.

[0012] Furthermore, this application also proposes that the injection actuator is made of a heat-resistant and wear-resistant alloy, and the working surface is nitrided or has a high-temperature wear-resistant coating.

[0013] Furthermore, this application also proposes that the working surface of the injection unit be provided with a flow guiding structure or a pressure boosting boss.

[0014] Furthermore, this application also proposes that the mating surface between the inner wall of the pressure chamber and the injection execution unit is a precision mating surface, with a mating gap of no more than 0.1 mm.

[0015] Furthermore, this application also proposes that the connecting device is one of a locking pin structure, a snap-fit ​​structure, an electromagnetic adsorption structure, or a hydraulic locking structure; when the large injection block reaches the end of its stroke, the connecting device automatically unlocks, allowing the drive source to start driving the small injection block independently.

[0016] Due to the adoption of the above technical solution, the beneficial effects achieved by this invention are as follows: 1. By using an injection block that moves perpendicular to the axis of the gating system and increasing the effective cross-sectional area, the filling flow rate can be significantly increased at the same movement speed. This can shorten the injection stroke to 10% or less of that of traditional axial injection, and quickly complete the cavity filling before the molten metal solidifies, effectively avoiding defects such as under-casting and cold shuts, significantly shortening the injection stroke and significantly improving the filling efficiency.

[0017] 2. High charging flow rate is achieved by relying on a large cross-sectional area, eliminating the need for high-speed drive and instantaneous high-flow hydraulic system. This eliminates the need for high-speed accumulators and matching high-precision control components required in traditional solutions, simplifies the drive system structure, and significantly reduces equipment manufacturing and maintenance costs. The elimination of high-speed accumulators also reduces equipment manufacturing costs.

[0018] 3. The short stroke significantly reduces the relative movement distance between the pressure chamber and the injection block, avoiding bending and uneven deformation of the long pressure chamber under high temperature and pressure, reducing interference between mating surfaces, wear and jamming risks, improving the operational stability and service life of the injection assembly, reducing high temperature deformation and wear, and extending the service life of the components.

[0019] 4. It adopts a combination structure of large injection blocks for rapid filling and small injection blocks for pressurization and pressure holding. The stage switching is realized through a detachable connection device, which takes into account both high filling speed and high pressure holding, and precise defect filling. It significantly improves the density of castings, reduces internal defects such as shrinkage cavities and porosity, realizes segmented injection control, and improves the casting forming quality.

[0020] 5. The pressure chamber and the injection block are precisely fitted with a gap controlled within 0.1mm. Combined with heat-resistant and wear-resistant materials and surface strengthening treatment, it effectively prevents leakage of high-pressure melt, ensures stable transmission of injection force, improves filling consistency and product qualification rate, and has high fitting accuracy and reliable sealing, thus improving process stability. Attached Figure Description

[0021] Figure 1 This is one of the structural schematic diagrams of a specific embodiment of the present invention; Figure 2 For the present invention Figure 1 Sectional view at point AA; Figure 3 This is a second structural schematic diagram of a specific embodiment of the present invention; Figure 4 For the present invention Figure 3 Sectional view at point BB; Figure 5 This is the third structural schematic diagram of a specific embodiment of the present invention; Figure 6 In this invention Figure 5 The front view; Figure 7 For the present invention Figure 6 Sectional view at CC; Figure 8 This is a schematic diagram showing the state of the large injection block reaching the end of its stroke in this invention; Figure 9 This is a schematic diagram of the state of the connecting device after the large injection block reaches the end of its stroke in this invention; Figure 10 This is a schematic diagram showing the small injection block moving to the end of its stroke in this invention.

[0022] The accompanying drawings, which are provided to further illustrate the invention and constitute a part of this invention, are illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention.

[0023] In the attached diagram: 1. Pressure chamber; 2. Injection execution structure; 21. Large injection block; 22. Small injection block; 4. Mold cavity; 5. Connecting device. Detailed Implementation

[0024] To more clearly illustrate the overall concept of the present invention, a detailed description will be provided below with reference to the accompanying drawings and examples.

[0025] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0026] Furthermore, in the description of this invention, it should be understood that the terms "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0027] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0028] In this invention, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "implementation," "example," "aspect," "specific example," or "specific example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0029] In traditional die casting, the injection assembly uses axial filling, with the injection head being a cylindrical structure that moves along the axis of the injection chamber. When the force applied to the injection head is constant, to increase the casting pressure, the diameters of the injection head and the injection chamber need to be reduced, leading to an increase in the length of the injection chamber and an excessively long stroke of the injection head. This structure causes the following technical problems: to complete filling before the molten metal solidifies, the speed of the injection head must be increased, placing higher demands on the drive and control systems; under high temperature and high pressure conditions, the long mating length between the injection chamber and the injection head easily leads to bending or uneven deformation of the injection chamber, exacerbating wear on the walls of the injection head and the injection chamber; simultaneously, the precision of the long-stroke mating is difficult to guarantee, increasing the difficulty of machining and maintenance, and consequently affecting the casting quality and production stability.

[0030] If the above problems are not addressed, the operational reliability of die-casting equipment will be severely affected. Continuous wear of the stamping chamber and stamping head will shorten the service life of critical components and increase equipment maintenance frequency. Instability in the filling process will make it difficult to guarantee the consistency of casting quality, leading to an increased scrap rate. Furthermore, reliance on high-speed drive systems keeps equipment manufacturing costs high, limiting the application of die-casting technology in demanding fields.

[0031] In this regard, refer to Figures 1-10 This application proposes an injection assembly for a die casting molding equipment, comprising a pressure chamber 1 and an injection execution structure, wherein the injection execution structure includes at least one injection execution unit 2. The injection unit 2 moves in a direction perpendicular to the axis of the mold gating system to push the molten liquid in the pressure chamber 1 into the mold cavity 4; The effective working cross-sectional area of ​​the injection actuator 2 is larger than that of a conventional cylindrical injection punch of the same specification. It can increase the filling flow rate and shorten the injection stroke at the same movement speed. The injection stroke of the injection assembly can be shortened to 10% or less of the conventional axial injection stroke. In many practical applications, there is a possibility that a high-speed accumulator is not required.

[0032] For ease of understanding, the following explains some key terms in this embodiment: Die casting equipment is an industrial device used to produce metal castings. It injects molten metal into a mold cavity under high pressure and solidifies it under pressure.

[0033] The injection assembly is the core component of the die casting equipment. It is responsible for pushing molten metal from the pressure chamber into the mold cavity and providing the necessary pressure to ensure the density and dimensional accuracy of the casting.

[0034] The pressure chamber 1 is a cavity in the die-casting equipment used to hold molten metal. It works in conjunction with the injection execution unit 2 to complete the injection process of the molten metal.

[0035] The injection actuator 2 is the component that directly acts on the molten metal and pushes it into the mold cavity 4. Its direction of movement and effective working cross-sectional area are key factors affecting injection efficiency and casting quality.

[0036] The mold gating system axis refers to the main axis of the molten liquid flow channel in the mold, which is usually parallel to the movement direction of the traditional injection punch.

[0037] Mold cavity 4 is the space inside the mold that forms the shape of the casting. Molten liquid is pressed into it and cooled and solidified.

[0038] Molten metal refers to metallic materials that are heated to a molten state during the die-casting process, such as aluminum alloys and zinc alloys.

[0039] The effective working cross-sectional area refers to the cross-sectional area of ​​the injection actuator 2 that contacts the molten liquid and applies thrust to it. The size of this area directly affects the distribution of the injection force on the molten liquid and the filling flow rate.

[0040] The filling flow rate refers to the volume of molten metal entering the mold cavity 4 through the mold gating system per unit time. Increasing the filling flow rate helps to shorten the filling time and reduce the risk of insufficient filling before the molten metal solidifies.

[0041] The injection stroke refers to the distance that the injection actuator 2 travels from its initial position to its final position to complete the molten metal injection. Shortening the stroke helps improve injection efficiency and equipment stability.

[0042] A high-speed accumulator is a device used to store energy and release high-pressure fluid in a short time. It is often used in traditional die-casting equipment to meet the demand for high-speed injection with large instantaneous flow rates.

[0043] The injection assembly consists of a pressure chamber 1 and an injection execution structure. The pressure chamber 1 is used to contain the molten material to be injected, and its structure can be open or closed to meet the needs of different die-casting processes. The injection execution structure is responsible for applying thrust to the molten material within the pressure chamber 1. For example, the pressure chamber 1 can be a simple rectangular groove, and the injection execution structure is a corresponding pusher plate.

[0044] The injection actuator structure includes at least one injection actuator 2. The injection actuator 2 is a component that directly contacts the molten metal and applies thrust to it. For example, a single, large injection actuator 2 can be used, the size of which matches the cross-section of the pressure chamber 1, to achieve overall propulsion of the molten metal.

[0045] The injection actuator 2 moves in a direction perpendicular to the axis of the mold gating system. In conventional die casting equipment, the injection punch typically moves along the axis of the mold gating system. In this embodiment, the direction of movement of the injection actuator 2 is set to be perpendicular to this axis. For example, the axis of the mold gating system can be horizontal, while the injection actuator 2 moves vertically upward or downward to push the molten metal into the mold cavity 4.

[0046] The injection unit 2 pushes the molten metal in the pressure chamber 1 into the mold cavity 4. This process is the core step in die casting. The injection unit 2 applies pressure to the molten metal in the pressure chamber 1 through its movement, forcing the molten metal to fill the mold cavity 4 at high speed. For example, the injection unit 2 can be driven by a hydraulic cylinder, which drives the injection unit 2 to move linearly through the piston rod, thereby completing the pushing of the molten metal.

[0047] The effective working cross-sectional area of ​​injection unit 2 is larger than that of a conventional cylindrical injection punch of the same specifications. Here, "same specifications" refers to a comparison under the same die-casting machine tonnage or the same melt handling capacity. By increasing the effective working cross-sectional area, a larger melt flow rate can be achieved without increasing the injection speed. For example, if the diameter of a conventional cylindrical punch is D, its cross-sectional area is π(D / 2). 2 Therefore, the effective working cross-sectional area of ​​the injection execution unit 2 in this embodiment can be designed to be much larger than this value, for example, a rectangular cross-section, whose length-width product is significantly larger than the cross-sectional area of ​​a traditional cylindrical punch.

[0048] Through the above design, the filling flow rate can be increased and the injection stroke shortened at the same punch movement speed. Due to the increased effective working cross-sectional area of ​​the injection actuator 2, the amount of molten metal pushed per unit time increases at the same movement speed, thereby increasing the filling flow rate. The increased filling flow rate allows the mold cavity 4 to be filled in a shorter time, thus shortening the movement distance of the injection actuator 2, i.e., the injection stroke.

[0049] Therefore, the injection stroke of the injection assembly can be designed or controlled to be 10% or less of the conventional axial injection stroke. Due to the significant increase in filling flow rate, the movement distance of the injection actuator 2 required to complete cavity filling is greatly reduced. For example, if the stroke of a conventional injection punch is 500 mm, the injection stroke in this embodiment can be designed to be 50 mm or less.

[0050] Furthermore, due to the significant increase in filling speed, this technical solution eliminates the need for a high-speed accumulator in many practical applications. Traditional die-casting equipment often requires a high-speed accumulator to provide a large instantaneous flow of hydraulic oil to achieve high-speed filling. This embodiment increases the effective working cross-sectional area of ​​the injection actuator 2, achieving a high filling flow rate at a lower movement speed. Therefore, the instantaneous flow requirement of the drive system is reduced, eliminating the need for a high-speed accumulator. For example, the drive system can be directly supplied with oil by a conventional hydraulic pump station, which is sufficient to meet the movement requirements of the injection actuator 2.

[0051] The injection assembly includes a pressure chamber 1 and an injection execution structure. Specifically, the pressure chamber 1 is designed as a rectangular groove for holding the molten metal. The injection execution structure includes a block-shaped injection execution unit 2 with a rectangular cross-section, and its effective working cross-sectional area is designed to be much larger than that of a conventional cylindrical injection punch. For example, the width of the injection execution unit 2 can match the width of the pressure chamber 1, while the height is set according to the required filling flow rate.

[0052] During the injection process, the injection actuator 2 moves in a direction perpendicular to the axis of the mold gating system. For example, the axis of the mold gating system can be arranged horizontally, while the injection actuator 2 moves vertically upward, pushing the molten metal in the pressure chamber 1 into the mold cavity 4. Because the effective working cross-sectional area of ​​the injection actuator 2 is significantly increased, even when moving at a relatively low speed, it can push a large amount of molten metal per unit time. For example, when the injection actuator 2 moves at a speed of 0.5 meters per second, its large cross-sectional area ensures that the molten metal fills the mold cavity 4 quickly with a sufficient flow rate.

[0053] As a result, the injection stroke required to fill the mold cavity 4 is significantly shortened. For example, traditional die-casting equipment may require an injection stroke of 500 mm to complete the filling, while the injection assembly of this embodiment may only require a stroke of 50 mm or even less. This short-stroke design not only reduces friction and wear between the injection execution unit 2 and the pressure chamber 1, extending the equipment's service life, but also reduces the demand for instantaneous flow rate in the drive system. Therefore, in many practical die-casting applications, this injection assembly does not require a high-speed accumulator, thereby reducing the equipment's manufacturing cost and maintenance difficulty. In this way, the injection assembly of this embodiment improves production efficiency and equipment reliability while ensuring casting quality, effectively solving the problems of high cost, short lifespan, and poor stability faced by traditional die-casting equipment.

[0054] Based on the above examples, the technical concept of this embodiment demonstrates a clear technical contribution. When producing castings with large dimensions and thin walls, traditional die-casting equipment must rely on high-speed injection punches and high-speed accumulators to ensure filling quality, which directly increases equipment manufacturing costs. For example, in the scenario of manufacturing large-dimensional, thin-walled aluminum alloy structural parts, the traditional solution requires a high-power hydraulic pump station and a high-speed accumulator to provide instantaneous high pressure and large flow rate, resulting in high investment and operation / maintenance costs.

[0055] In contrast, this embodiment achieves high charging flow rate at a lower movement speed by changing the movement direction of the injection actuator 2 and increasing its effective working cross-sectional area. For example, under the same charging flow rate requirement, the movement speed of the injection actuator 2 in this embodiment can be much lower than that of a traditional cylindrical punch, thereby reducing the instantaneous power requirements of the drive system and making a high-speed accumulator unnecessary. This directly reduces the initial investment and long-term operating costs of the equipment.

[0056] Furthermore, the long injection stroke of traditional die-casting equipment results in a large contact length between the pressure chamber 1 and the injection punch under high temperature and pressure, which easily leads to bending deformation and severe wear, and even interference and damage, thus affecting the casting quality and equipment lifespan. This embodiment shortens the injection stroke to 10% or less of the traditional axial injection stroke, significantly reducing the relative movement distance and contact time between the injection actuator 2 and the pressure chamber 1. For example, in the above example, the short stroke of 50 mm, compared to the traditional long stroke of 500 mm, greatly reduces the risk of wear and deformation, thereby extending the equipment lifespan and improving the casting accuracy and production stability.

[0057] In summary, this embodiment, through its innovative design and movement mode of the injection actuator 2, effectively solves the technical problems of traditional die-casting equipment in terms of cost, lifespan, and stability without sacrificing filling efficiency. This technical solution demonstrates clear progress in terms of economy, reliability, and efficiency.

[0058] Reference Figures 1-10 This application further proposes that the above-mentioned injection actuator 2 is a block-shaped, plate-shaped, or columnar structure, and its cross-section is rectangular, circular, or other suitable shape.

[0059] The injection unit 2 is designed as a block, plate, or columnar structure—these are terms describing its overall geometry. A block structure typically refers to a solid entity with a certain volume and relatively similar length, width, and height dimensions, emphasizing its solidity and integrity, such as a solid cuboid. A plate structure refers to a flat structure with a thickness much smaller than its length and width, emphasizing its planar characteristics and ability to cover a large area. A columnar structure refers to a structure with a certain length and a consistent cross-sectional shape, emphasizing its extension along a specific direction, such as a column with a non-circular cross-section. This choice of structural form aims to provide a diverse physical basis for the injection unit 2, adapting to different pressure chamber 1 geometries and die-casting process requirements.

[0060] The cross-section of the injection actuator 2 can be rectangular, square, or an irregular polygon, or other suitable shapes. The cross-section refers to the shape of the cut surface perpendicular to the direction of movement of the injection actuator 2. Rectangular and square shapes are common geometries, easy to manufacture, and provide a regular thrust surface, facilitating a tight fit with the inner wall of the pressure chamber 1. Irregular polygons refer to geometries other than rectangular and square shapes, having multiple sides and corners. They can be customized according to the specific shape or filling requirements of the pressure chamber 1 to optimize hydrodynamic performance or improve sealing. For example, irregular polygons can be designed with specific chamfers or curved edges to reduce melt flow resistance or improve sealing.

[0061] The solution of this application designs the injection actuator 2 as a block, plate, or columnar structure with a rectangular, square, or irregular polygonal cross-section, or other suitable shape, allowing the injection actuator 2 to more effectively utilize the internal space of the pressure chamber 1. Compared to traditional cylindrical injection punches, this non-circular cross-sectional design, such as a rectangular or plate-like structure, significantly increases the effective contact area with the molten metal in the direction perpendicular to the mold gating system axis. When the injection actuator 2 moves vertically, its large non-circular working surface can more evenly and efficiently push the molten metal in the pressure chamber 1. This structural design not only ensures that more molten metal can be pushed into the mold cavity 4 at the same movement speed, thereby significantly increasing the filling flow rate and significantly shortening the injection stroke, but also, due to its regular or customized cross-sectional shape, it can form a tighter fit with the inner wall of the pressure chamber 1, effectively reducing molten metal leakage and improving the stability and efficiency of the injection process. Furthermore, this non-circular cross-sectional design, in conjunction with the pressure chamber 1, enables the injection actuator 2 to maintain its posture more stably during vertical movement, reducing the risk of tilting or jamming and ensuring the smoothness of the injection process.

[0062] In one specific implementation, the injection unit 2 can be designed as a plate-like structure with a rectangular cross-section. The height of this plate-like structure can match the vertical height of the pressure chamber 1, while its width can be optimized according to the horizontal dimensions of the pressure chamber 1 to maximize its effective working cross-sectional area. For example, its cross-section can be a rectangle with an aspect ratio of 3:1, with its long side parallel to the width direction of the pressure chamber 1 and its short side corresponding to its thickness in the direction of movement. During the injection process, this plate-like structure moves smoothly in the vertical direction within the pressure chamber 1, and its large rectangular working surface can efficiently push the molten liquid into the mold cavity 4.

[0063] Through the above technical solution, this application effectively solves the problem of how to specifically realize the geometry of the injection actuator 2 to efficiently push the molten metal. This structural design allows the injection actuator 2 to fully utilize the internal space of the pressure chamber 1, significantly increasing its effective cross-sectional area, thereby pushing the molten metal more efficiently in the direction perpendicular to the axis of the mold gating system. This not only ensures a significant increase in filling flow rate and a shorter injection stroke at the same movement speed, but also, due to its regular or customized cross-sectional shape, it can form a tighter fit with the inner wall of the pressure chamber 1, effectively reducing molten metal leakage and improving the stability and efficiency of the injection process. Ultimately, this optimized structural form eliminates the need for a high-speed accumulator in the die-casting process, thereby reducing equipment costs and complexity and improving the overall performance of the die-casting equipment. This application further proposes a pressure injection actuation structure comprising two independent pressure injection actuation units 2. These two pressure injection actuation units 2 each have a height... Hi and width W i ( i =1, 2), two injection actuators 2, moving synchronously in parallel along the same or opposite directions, with a filling volume DV of molten material per unit time. H 1 W 1 v 1 + H 2 W 2 v 2 ,in v 1 and v 2 The speeds of the two injection blocks in the injection actuator 2 are respectively. "Two independent injection actuators 2" means that the injection actuator structure is not a single unit, but rather composed of two physically separate but functionally coordinated units. These two independent structures can be driven by independent drive sources (such as hydraulic cylinders or servo motors) to achieve precise motion control; alternatively, they can be mounted on the same drive mechanism and driven as a whole by a main drive source, while still maintaining their physical "independence" or correlation. "Height" H i ,width W i The geometry of each injection unit 2 is defined. These dimensions can be customized according to the geometry of the pressure chamber 1 and the sprue size of the mold cavity 4 to ensure that the molten liquid can enter the cavity efficiently and uniformly.

[0064] In actual operation, the two injection actuators 2 move synchronously in the same direction. This "synchronous movement" can be achieved through a mechanical linkage mechanism to ensure that the displacement and speed of the two injection actuators 2 remain consistent; or, electronic synchronization can be achieved through an independent drive system combined with a high-precision sensor and a closed-loop control system. When the injection actuators 2 are activated, if the two independent structures simultaneously move at a certain speed... v The molten liquid in the pressure chamber 1 is pushed. Since there are two independent injection actuators 2, their total effective working cross-sectional area is the sum of the areas of a single injection actuator 2 (i.e., ...). H 1 × W 1 + H 2 × W 2 Therefore, at the same speed of motion v 2Below, the volume of molten metal filling the mold per unit time ΔV 2 Able to achieve ( H 1 × W 1 + H 2 × W 2 )× v This formula intuitively expresses how, by increasing the number of injection actuators 2, at the same speed of motion... v Below, the volume of molten metal filling per unit time Δ V 2 This configuration can significantly improve the filling speed, resulting in faster mold filling. It allows the molten metal to be pushed into the mold cavity 4 at a higher flow rate, further reducing filling time and improving production efficiency. Simultaneously, the synchronized movement of the two injection actuators 2 helps to create a more uniform molten metal flow within the pressure chamber 1, reducing turbulence and filling instability, thereby improving the quality of the final casting.

[0065] Through the above technical solution, this application effectively solves the limitations that a single injection actuator may encounter when pursuing higher filling flow rate and more uniform filling pressure by configuring two independent injection actuators 2 and making them move synchronously in the same direction. This dual-injection actuator design, while maintaining the advantages of short injection stroke and no need for a high-speed accumulator, significantly increases the molten filling volume per unit time, thereby further improving the efficiency and speed of die casting. Furthermore, the coordinated advancement of the two injection actuators 2 helps to form a more stable and uniform flow field when the molten metal enters the mold cavity 4, reducing casting defects caused by uneven filling, and thus improving the quality and yield of the castings.

[0066] In other embodiments, this application proposes an injection assembly for a die-casting molding apparatus, wherein the pressure chamber 1 works in conjunction with an injection execution structure. The injection execution structure includes at least one injection execution unit 2, which moves in a direction perpendicular to the axis of the mold gating system to push the molten metal in the pressure chamber 1 into the mold cavity 4. The effective working cross-sectional area of ​​the injection execution unit 2 is larger than that of a conventional cylindrical injection punch of the same specification, thereby increasing the filling flow rate and shortening the injection stroke at the same movement speed. This results in the injection stroke of the injection assembly being 10% or less of the conventional axial injection stroke, and eliminating the need for a high-speed accumulator.

[0067] Reference Figures 5-10This application further proposes that the injection execution unit 2 includes a large injection block 21 and a small injection block 22, which can slide relative to each other along the same direction of movement; the small injection block 22 is closer to the mold gate, the large injection block 21 is used for rapid filling, and the small injection block 22 is used for pressurization, pressure holding and filling defects.

[0068] Specifically, the injection execution unit 2 is no longer a single, monolithic structure, but rather composed of two or more independent injection units: a large injection block 21 and a small injection block 22. This separate design allows each injection block to perform different functions or play a role at different stages, thereby optimizing the entire injection process. For example, the large injection block 21 can be designed with a larger cross-sectional area or stronger thrust to meet the needs of rapid filling; while the small injection block 22 can be designed to be more flexible and easier to control precisely to adapt to the delicate operations of the pressurization, holding, and filling stages. The large injection block 21 and the small injection block 22 can slide relative to each other along the same direction of movement, meaning that the large injection block 21 and the small injection block 22 are not rigidly connected and can move independently or semi-independently in the injection direction. This relative sliding capability is key to achieving staged injection control. For example, the large injection block 21 and the small injection block 22 can be driven separately by independent drive mechanisms (such as hydraulic cylinders, servo motors, etc.), or they can be allowed to move relative to each other under specific conditions through mechanical linkage mechanisms. This design allows for adjustment of the relative position and speed of the two injection blocks during the injection process to adapt to the requirements of different injection stages. After the large injection block 21 completes injection, the smaller injection block 22 maintains a predetermined distance from the mold gate. This positional relationship defines the initial or relative layout of the two injection blocks within the pressure chamber 1. This layout facilitates rapid filling, allowing the large injection block 21 to initially push most of the molten metal in the pressure chamber 1 into the mold cavity, while the smaller injection block 22 plays a role in subsequent stages, such as providing continuous pressure during pressurization and holding, or precisely replenishing molten metal during fill-in. The large injection block 21 is used for rapid filling, the first stage of the die-casting process, which requires injecting a large amount of molten metal at high speed into the mold cavity 4 within a very short time. The large injection block 21 is specifically designed for this purpose, potentially having a large effective cross-sectional area, coupled with high-speed drive, to ensure that the molten metal can quickly fill the cavity 4, avoiding defects such as cold shuts and under-casting. The small injection block 22 is used for pressurization, pressure holding, and defect filling. These stages are subsequent phases of the die casting process, requiring high precision and stability in injection. The pressurization stage requires applying higher pressure to increase the density of the casting; the pressure holding stage requires maintaining a certain pressure to compensate for the solidification shrinkage of the molten metal; and the defect filling stage may require a small, precise replenishment of molten metal. The small injection block 22 is designed to perform these delicate tasks. It may have a smaller cross-sectional area or be coupled with a more precise drive system to achieve precise control of pressure and molten metal volume, effectively improving the quality and yield of the casting.

[0069] The solution of this application achieves phased optimized control of the injection process by designing the injection execution unit 2 to include a large injection block 21 and a small injection block 22, allowing them to slide relative to each other along the same direction of movement. The small injection block 22 is positioned at an appropriate distance from the mold gate. In the initial stage of die casting, the large injection block 21, with its design advantages, can efficiently and quickly push a large amount of molten metal into the mold cavity 4, fully utilizing the characteristics of large cross-sectional area and short stroke of transverse injection to ensure rapid filling and effectively avoid defects caused by premature solidification of the molten metal. As the filling stage is completed, or at a preset switching point, the small injection block 22 takes over or coordinates with the large injection block 21. Because the small injection block 22 can slide relative to the mold, it can be controlled independently or more precisely to perform subsequent pressurization, holding, and defect filling functions. During the pressurization stage, the small injection block 22 applies higher pressure to increase the density of the casting; during the holding stage, it maintains stable pressure to compensate for the solidification shrinkage of the molten metal; and during the filling stage, it can precisely add a small amount of molten metal. This collaborative mechanism allows the injection parameters to be flexibly adjusted according to the needs of different stages, avoiding the contradiction between rapid filling and precise control in a single injection structure, and significantly improving the quality and production efficiency of die castings.

[0070] In one specific implementation, the large injection block 21 and the small injection block 22 can be integrated into a common guiding structure, such as a guide groove provided on the side wall of the pressure chamber 1. The large injection block 21 can be driven by a main hydraulic cylinder, which provides the high speed and large thrust required for rapid filling. The small injection block 22 can be driven by an independent auxiliary hydraulic cylinder or servo electric actuator, which can provide more precise position and pressure control to meet the needs of the pressurization, holding, and filling stages. The relative sliding between the large injection block 21 and the small injection block 22 can be achieved by a mechanical structure, for example, the small injection block 22 can be installed in a groove inside the large injection block 21, or both can be guided by an independent guide rail system. At the start of injection, the main hydraulic cylinder drives the large injection block 21 forward at high speed, rapidly pushing the molten metal into the mold cavity 4. When the mold cavity 4 is nearly full, the speed of the large injection block 21 can be reduced or stopped, at which point the auxiliary drive source drives the small injection block 22 to continue forward for pressurization, holding, and filling operations. The design of the smaller injection block 22, which is further away from the mold gate, ensures that the larger injection block 21 has sufficient stroke and space during rapid filling, while the smaller injection block 22 provides fine control in subsequent stages.

[0071] Through the above technical solution, the injection execution unit 2 is subdivided into a large injection block 21 and a small injection block 22, allowing them to slide relative to each other. This optimizes and precisely controls the rapid filling process and subsequent pressurization, holding, and defect filling functions during die casting. The large injection block 21 fully utilizes the advantage of its large cross-sectional area in transverse injection, achieving rapid and efficient filling of the molten metal, effectively shortening the filling time and reducing the risk of defects such as cold shuts and under-casting in the casting. Meanwhile, the small injection block 22 focuses on providing precise pressure control and molten metal replenishment, significantly improving the density and internal quality of the casting and effectively reducing the occurrence of defects such as shrinkage cavities and porosity. This staged and refined injection control strategy significantly improves the overall quality and yield of die castings and better adapts to the differentiated requirements of different castings for the injection process.

[0072] Reference Figures 5-10 This application further proposes that a detachable connection device 5 is provided between the large injection block 21 and the small injection block 22, and the large injection block 21 is disconnected from the small injection block 22 after reaching the end of its stroke.

[0073] The detachable connection device 5 is a mechanism used to connect and separate two components under specific conditions. Its function is to control the coordinated or independent movement of the large injection block 21 and the small injection block 22 as needed at different stages of the injection process. This device can be implemented in various ways, such as locking and unlocking through mechanical structures (e.g., pins, wedges, levers), adsorption and release through electromagnetic force, or connection and separation through hydraulic or pneumatic pressure. The connection between the large injection block 21 and the small injection block 22 is released after the large injection block 21 reaches the end of its stroke. This technical feature means that during the injection process, when the large injection block 21 completes its predetermined rapid filling task and moves to the end of its stroke, the connection device 5 is activated, thereby interrupting the physical connection between the large injection block 21 and the small injection block 22. This is intended to ensure that after the large injection block 21 has completed its main function, it will no longer have any mechanical interference or influence on the subsequent fine operations of the small injection block 22 (such as pressurization, pressure holding and filling), thereby allowing the small injection block 22 to perform its tasks independently and accurately.

[0074] The solution of this application achieves flexible switching of the injection execution unit 2 at different injection stages by setting a detachable connecting device 5 between the large injection block 21 and the small injection block 22, and disconnecting the large injection block 21 from the small injection block 22 after the large injection block 21 reaches the end of its stroke. In the initial stage of injection, the large injection block 21 and the small injection block 22 are connected by the connecting device 5, jointly pushing the molten metal for rapid filling. When the large injection block 21 reaches its end of its stroke and completes the rapid filling task, the connecting device 5 is triggered, separating the large injection block 21 from the small injection block 22. Afterward, the large injection block 21 stops moving or remains at the end of its stroke, while the small injection block 22 can continue to move forward independently, performing precise operations such as pressurization, pressure holding, and defect filling. This separation mechanism ensures that the injection execution unit 2 can flexibly adjust its working mode according to needs at different injection stages, avoiding unnecessary obstruction of the movement accuracy and control force of the small injection block 22 by the large injection block 21 in subsequent stages.

[0075] In one specific implementation, the detachable connection device 5 can be a locking pin structure. A retractable locking pin is provided on the side or rear end of the large injection block 21, and a corresponding locking hole is provided on the small injection block 22. During the initial injection phase, the locking pin extends and inserts into the locking hole, firmly connecting the large injection block 21 and the small injection block 22, achieving synchronous movement. When the large injection block 21 moves to a preset end point of its travel, a mechanical trigger mechanism or position sensor detects the position signal of the large injection block 21, driving the locking pin to retract, thereby releasing the connection between the large injection block 21 and the small injection block 22. Afterward, the small injection block 22 continues to move forward under the action of an independent drive source, completing the subsequent pressurization and pressure holding tasks, while the large injection block 21 remains stationary.

[0076] Through the above technical solution, a detachable connecting device 5 is set between the large injection block 21 and the small injection block 22, and this device is disconnected from the small injection block 22 after the large injection block 21 reaches the end of its stroke. This solution can effectively solve the problem of interference between the large injection block 21 and the subsequent pressurization, holding, and defect filling operations of the small injection block 22 after the large injection block 21 completes the rapid filling task. This design allows the small injection block 22 to perform its function independently and accurately, avoiding the influence of the inertia or resistance of the large injection block 21 on the fine control of the small injection block 22, thereby improving the accuracy and stability of the injection process. Especially in the pressurization and holding stages, it can more effectively control the pressure of the molten metal, improving the density and quality of the casting.

[0077] In some other embodiments, this application proposes an injection assembly for a die-casting molding apparatus, comprising a pressure chamber 1 and an injection execution structure, the injection execution structure including at least one injection execution unit 2. The injection execution unit 2 moves along a direction perpendicular to the axis of the mold gating system to push the molten metal in the pressure chamber 1 into the mold cavity 4. The effective working cross-sectional area of ​​the injection execution unit 2 is larger than that of a conventional cylindrical injection punch of the same specification, thereby increasing the filling flow rate and shortening the injection stroke at the same movement speed. The injection stroke of the injection assembly is 10% or less of the conventional axial injection stroke, and no high-speed accumulator is required. The injection execution unit 2 is a block, plate, or columnar structure with a rectangular, square, or irregular polygonal cross-section.

[0078] This application further proposes that the injection execution unit 2 of the above-mentioned injection assembly is made of heat-resistant and wear-resistant alloy, and the working surface is nitrided or has a high-temperature wear-resistant coating.

[0079] The injection actuator 2 is made of a heat-resistant and wear-resistant alloy, meaning that the body material of the injection actuator 2 is selected from alloy materials that can maintain high hardness, strength, and wear resistance even at high temperatures. These alloys typically improve their heat resistance and wear resistance by adding elements such as chromium, tungsten, molybdenum, cobalt, and nickel to form carbides or nitrides, or through solid solution strengthening mechanisms. For example, high-temperature alloys, such as nickel-based or cobalt-based high-temperature alloys, can be selected, as they possess excellent oxidation resistance and creep strength at high temperatures; or high-strength wear-resistant steels, such as high-speed steel or certain special tool steels, can be selected, with their matrix strengthened through heat treatment and hard phase precipitation to improve wear resistance. This material selection fundamentally ensures that the injection actuator 2 maintains its structural integrity, dimensional accuracy, and surface hardness even under long-term contact with high-temperature molten metal and high-pressure, high-speed friction, preventing failure due to material softening, deformation, or rapid wear.

[0080] The working surface undergoes nitriding treatment, which involves a surface heat treatment process where the working surface of the injection actuator 2 is heated in a nitrogen-containing medium, causing nitrogen atoms to penetrate into the metal surface and form a nitride layer. This treatment significantly improves surface hardness, wear resistance, fatigue strength, and corrosion resistance. Specific implementation methods include gas nitriding, which uses the decomposition of ammonia to generate active nitrogen atoms for penetration; or ion nitriding (plasma nitriding), which uses plasma to bombard the workpiece surface in a vacuum environment. Nitriding treatment significantly improves the hardness and wear resistance of the working surface of the injection actuator 2 without significantly altering the toughness of the base material, effectively resisting the erosion and friction of molten metal and extending its service life.

[0081] The working surface is coated with a high-temperature and wear-resistant coating, which refers to the deposition of a thin film with excellent high-temperature resistance and wear resistance on the working surface of the injection actuator 2 through physical or chemical methods. These coatings are typically composed of ceramics, hard metal compounds, or composite materials. For example, physical vapor deposition (PVD) can be used to deposit coatings such as TiN, TiAlN, and CrN, which have high hardness, low coefficient of friction, and good heat resistance; or chemical vapor deposition (CVD) can be used to prepare diamond or silicon carbide coatings, which have extremely high hardness, wear resistance, and excellent corrosion resistance; or thermal spraying can be used to form thicker ceramic coatings (such as alumina or chromium oxide) or hard alloy coatings. The high-temperature and wear-resistant coating provides an additional protective barrier for the working surface of the injection actuator 2, further enhancing its service performance under extreme high-temperature and high-wear conditions and preventing the substrate material from being directly exposed to harsh environments.

[0082] The injection actuator 2 of the aforementioned injection assembly is designed to improve filling efficiency by increasing the effective working cross-sectional area and shortening the injection stroke. However, this working method requires the working surface of the injection actuator 2 to frequently and directly contact high-temperature, high-pressure molten metal, and endure its high-speed erosion and friction. Therefore, this application fundamentally ensures its structural stability and overall wear resistance under high-temperature conditions by selecting a heat-resistant and wear-resistant alloy as the base material of the injection actuator 2. Furthermore, nitriding or applying a high-temperature wear-resistant coating to the working surface of the injection actuator 2 further enhances its surface hardness, wear resistance, thermal fatigue resistance, and corrosion resistance. This combination of material and surface treatment allows the injection actuator 2 to maintain the stability of its precision mating surfaces and geometry even under harsh die-casting conditions, effectively resisting the erosion and wear of the molten metal. This ensures a smooth injection process, stable filling flow, and precise control of the clearance between the pressure chamber 1 and the injection actuator 2, thereby maintaining the overall performance and service life of the injection assembly.

[0083] As a specific implementation, the injection actuator 2 can be made of H13 hot work die steel, which has good high-temperature strength and toughness. To further improve the performance of its working surface, the working surface of the injection actuator 2 can be ion nitrided to form a high-hardness nitrided layer, effectively resisting wear and erosion from molten metal. Alternatively, a TiAlN (titanium aluminum nitride) coating can be prepared on the working surface of the injection actuator 2 using physical vapor deposition (PVD) technology. This coating not only has extremely high hardness and excellent wear resistance, but also maintains good oxidation resistance at high temperatures, thus providing long-lasting protection for the injection actuator 2.

[0084] Through the above technical solutions, the heat resistance and wear resistance of the injection actuator 2 are significantly improved, effectively solving the technical problems of easy wear, deformation, and corrosion under high temperature, high pressure, and high speed conditions. This not only greatly extends the service life of the injection actuator 2 and reduces maintenance and replacement costs, but also ensures the stability and accuracy of the injection process, avoiding problems such as molten liquid leakage, unstable mold filling, and reduced casting quality caused by wear of the injection actuator 2, thereby significantly improving the efficiency and product qualification rate of die casting production.

[0085] This application further proposes the above-mentioned injection assembly, wherein the working surface of the injection execution unit 2 is provided with a flow guiding structure or a pressure boosting boss to improve filling stability and pressure holding effect.

[0086] The working surface of the injection unit 2 refers to the surface of the injection unit 2 that directly contacts the molten metal and applies thrust to it. This working surface is the key interface for achieving molten metal filling and pressure holding. The flow guiding structure refers to the geometric features set on the working surface of the injection unit 2 to guide the flow direction of the molten metal and optimize the flow field distribution. These can be, but are not limited to, grooves, ridges, slopes, manifolds, or holes, designed to reduce turbulence and eddies in the molten metal during filling, promoting smooth and uniform entry of the molten metal into the mold cavity 4. The pressure-boosting boss refers to the raised structure set on the working surface of the injection unit 2 to apply additional or concentrated pressure to the molten metal in a specific area. These can be, but are not limited to, localized protrusions, stepped bosses, or conical bosses, designed to enhance the local pressure holding effect of the molten metal within the mold cavity 4, compensate for solidification shrinkage, thereby improving the density of the casting and reducing defects such as shrinkage cavities and porosity. Improving filling stability refers to optimizing the flow path and velocity distribution of the molten metal to reduce fluctuations, splashing, or turbulence during filling the mold cavity 4, ensuring that the molten metal can smoothly and continuously fill the cavity and avoid defects such as porosity and cold shuts. Pressure holding effect refers to continuously applying pressure after the molten metal has filled the mold to compensate for the volume shrinkage of the molten metal during solidification, preventing defects such as shrinkage cavities and porosity inside the casting, thereby improving the density and mechanical properties of the casting.

[0087] The solution proposed in this application effectively solves the problems of stability and insufficient local pressure during the molten filling and holding process by setting a flow guiding structure or a pressure boosting boss on the working surface of the injection execution unit 2. Specifically, when the injection execution unit 2 moves in a direction perpendicular to the axis of the mold gating system and pushes the molten liquid in the pressure chamber 1 into the mold cavity 4, the flow guiding structure on its working surface can effectively guide the high-speed flowing molten liquid, allowing it to enter the cavity in a more stable and orderly manner. This avoids turbulence, splashing, or impact of the molten liquid, thereby significantly improving the stability of the filling process and reducing the risk of defects such as porosity and cold shuts in the casting. At the same time, when the molten liquid has finished filling and entered the holding stage, the pressure boosting boss on the working surface can apply more concentrated and effective pressure to specific areas within the mold cavity 4, compensating for the volume shrinkage during the solidification process of the molten liquid, ensuring the internal density of the casting, and effectively preventing defects such as shrinkage cavities and porosity, thereby improving the holding pressure effect. Given that the injection unit 2 itself has a large effective working cross-sectional area and a short injection stroke, combined with the precise control of the flow guiding structure and the pressure boosting boss, the molten metal can achieve excellent flow field stability and local pressure holding capability while rapidly filling the mold, thereby improving the overall quality of the casting and production efficiency.

[0088] In one specific implementation, the working surface of the injection unit 2 can be provided with a flow guiding structure. For example, multiple V-shaped or U-shaped flow guiding grooves are etched on the working surface along the direction of melt flow. These flow guiding grooves can divert the melt and guide it to fill the mold cavity 4 evenly. Alternatively, in another implementation, the working surface of the injection unit 2 can be provided with pressure-boosting bosses. For example, several cylindrical or frustum-shaped protrusions are integrally formed in the central area of ​​the working surface or near the depth of the mold cavity 4. After the injection unit 2 completes the filling, these protrusions can apply local high pressure to the melt to enhance the pressure holding effect.

[0089] By employing the aforementioned technical solution, a flow-guiding structure or a pressure-boosting boss is installed on the working surface of the injection unit 2. This effectively optimizes the flow state of the molten metal within the mold cavity 4, significantly improving the stability of the filling process and reducing the probability of defects such as porosity and cold shuts in the casting. Simultaneously, the pressure-boosting boss allows for more precise and effective local pressure application to the molten metal during the holding pressure stage, thereby compensating for molten metal solidification shrinkage and greatly improving the density of the casting, effectively preventing internal defects such as shrinkage cavities and porosity. Therefore, this solution, while maintaining high filling efficiency and short stroke advantages, further improves the internal quality and yield of die-cast parts.

[0090] This application further proposes that the mating surface between the inner wall of the pressure chamber 1 and the injection execution unit 2 is a precision mating surface, with a mating clearance of no more than 0.1 mm. Specifically, the mating surface between the inner wall of the pressure chamber 1 and the injection execution unit 2 refers to the surfaces inside the pressure chamber 1 and outside the injection execution unit 2 that are in contact with or closely adjacent to each other. These surfaces are key interfaces that prevent molten liquid from leaking from around the injection execution unit 2 when the molten liquid is pushed within the pressure chamber 1. These mating surfaces can be precision machined, such as grinding, honing, or polishing, to achieve high surface finish and dimensional accuracy. A precision mating surface refers to a surface that has undergone high-precision machining and assembly, resulting in extremely small clearances and high contact consistency between the surfaces of two mating parts. Such mating surfaces typically require high dimensional and geometric tolerances, which can be achieved, including but not limited to: using advanced manufacturing processes such as CNC precision grinding, electrical discharge machining (EDM), and laser processing to form the mating surface; or applying special coating treatments, such as PVD / CVD coatings, to the mating surface to improve its hardness and wear resistance while ensuring mating accuracy. A clearance of no more than 0.1 mm is a quantitative limit on the maximum allowable gap between precision mating surfaces. 0.1 mm is an extremely small gap, typically requiring high-precision machining equipment and rigorous assembly processes to achieve. This can be achieved by selecting materials with high rigidity and stability to reduce thermal and mechanical deformation; employing advanced measurement technologies, such as coordinate measuring machines or laser interferometers, to accurately measure and calibrate the mating surfaces; and using preload or hydraulic clamping during assembly to ensure tight contact between the mating surfaces.

[0091] The solution in this application designs the mating surfaces of the inner wall of the pressure chamber 1 and the injection actuator 2 as precision mating surfaces, and strictly controls the mating clearance to be no greater than 0.1 mm. This ensures that when the injection actuator 2 moves within the pressure chamber 1, the possibility of molten metal leakage from the mating clearance is minimized. This extremely small mating clearance effectively prevents the overflow of high-pressure molten metal, thereby ensuring the effective transmission of injection force and the integrity of the filling process. Given that the injection actuator 2 moves along a direction perpendicular to the axis of the mold gating system and has a large effective working cross-sectional area, this precision fit is particularly crucial. It not only maintains the advantages of high filling flow rate and short injection stroke, but also avoids incomplete filling, flash, or product defects caused by leakage. It is precisely because of this tight fit that the molten metal can be efficiently and stably pushed into the mold cavity 4 within the pressure chamber 1, thereby fully leveraging the performance advantages of the new injection assembly.

[0092] The following is a specific example. As a concrete implementation, the inner wall of the pressure chamber 1 can be made of high-strength, wear-resistant alloy steel and machined using precision CNC grinding to achieve a surface roughness of Ra0.2 or less, ensuring that its inner diameter's roundness, cylindricity, and other dimensional tolerances are within the micrometer level. Simultaneously, the mating surfaces of the injection actuator 2 are also made of the same or similar materials and undergo precise grinding and polishing to ensure their surface finish matches that of the inner wall of the pressure chamber 1. During assembly, high-precision measuring tools (such as pneumatic gauges or laser diameter gauges) are used to monitor and adjust the mating clearance in real time, ensuring that the mating clearance between the inner wall of the pressure chamber 1 and the injection actuator 2 remains within 0.1 mm throughout the entire stroke. Furthermore, an ultra-hard wear-resistant coating, such as titanium nitride (TiN) or tungsten carbide (WC) coating, can be applied to the mating surfaces to further improve their wear resistance and anti-adhesion properties, thereby maintaining a precise fit over a long period.

[0093] Through the above technical solution, the mating surface between the inner wall of the pressure chamber 1 and the injection execution unit 2 is precisely controlled to achieve a tight fit with extremely small clearance, effectively solving the leakage problem that may occur in the molten metal during high-pressure injection. This not only significantly improves the filling efficiency and injection stability of the molten metal, avoiding material waste and product defects caused by leakage, but also ensures that the injection execution unit 2 can fully utilize its advantages of large cross-sectional area and short stroke, thereby obtaining high-quality die-cast parts.

[0094] This application further proposes that the connecting device 5 is one of a locking pin structure, a snap-fit ​​structure, an electromagnetic adsorption structure, or a hydraulic locking structure; when the large injection block 21 reaches the dead point position, the connecting device 5 automatically unlocks, allowing the drive source to drive the small injection block 22 independently.

[0095] The connecting device 5 is a key component for enabling the disengageable connection between the large injection block 21 and the small injection block 22. Locking pin structures typically achieve connection and separation through the insertion and removal of a mechanical pin. For example, when the large injection block 21 moves to a specific position, an external drive mechanism can control the pin's ejection or retraction. Snap-fit ​​structures utilize elasticity or mechanical deformation to achieve rapid engagement and disengagement. For example, through the cooperation of protrusions and grooves, separation is triggered by external force or its own mechanism under specific conditions. Electromagnetic adsorption structures use electromagnetic force to attract the two components together, controlling the presence or absence of adsorption force by controlling the flow of current, thereby achieving connection and separation. Hydraulic locking structures provide strong locking force through hydraulic cylinders or hydraulic pins, and achieve locking and release through pressure control of the hydraulic system. The choice of these structures depends on factors such as the specific application scenario, the required connection strength, separation speed, and operating environment.

[0096] "Dead point position" refers to the position where the large injection block 21 reaches the end of its stroke after completing its main filling task. At this position, the large injection block 21 has usually pushed most of the molten metal into the mold cavity 4. "Automatic unlocking" means that without additional manual intervention or complex external commands, when the large injection block 21 reaches the preset dead point position, the connecting device 5 can automatically or through a simple triggering mechanism to complete the separation action. This can be achieved through mechanical triggering, position sensor signal triggering, or time control. For example, a limit switch can be set at the dead point position, and when the large injection block 21 touches the switch, the unlocking mechanism of the connecting device 5 is triggered. After the connecting device 5 automatically unlocks, the large injection block 21 separates from the small injection block 22. At this time, the drive source that originally drove the large injection block 21 and the small injection block 22 to move together, or another independent drive source, will only act on the small injection block 22. This means that the small injection block 22 can continue its stroke independently, performing precise operations such as pressurization, pressure holding, and pressure filling, while the large injection block 21 remains at the dead point and no longer participates in subsequent movements. This independent drive mode ensures that the small injection block 22 can complete its specific function with more precise control and less inertia.

[0097] The solution of this application introduces a detachable connecting device 5 into the injection execution unit 2, and sets it to automatically unlock when the large injection block 21 reaches the dead point position, thereby realizing the separation of the large injection block 21 and the small injection block 22, and allowing the drive source to drive the small injection block 22 independently. In the initial stage of injection, the large injection block 21 and the small injection block 22 are tightly connected by the connecting device 5, together forming an integrated injection execution unit 2, which rapidly pushes the molten metal to fill the mold cavity 4 with its larger effective cross-sectional area. When the large injection block 21 completes the rapid filling task and reaches the dead point position of its stroke, the connecting device 5 is designed to automatically trigger an unlocking mechanism, such as through mechanical contact, position sensing, or preset timing control, to disengage the connection between the large injection block 21 and the small injection block 22. Once separated, the large injection block 21 stops moving, while the drive source can continue to act on the small injection block 22, causing it to move forward independently. This design allows the small injection block 22 to perform pressurization, pressure holding, and defect filling operations with more precise speed and pressure without the inertial influence of the large injection block 21, thereby optimizing the quality of the die casting. Through this staged, collaborative injection process, both rapid filling efficiency and refined subsequent injection control are ensured.

[0098] In one specific implementation, the connecting device 5 can adopt a locking pin structure. In this structure, the large injection block 21 is provided with a retractable locking pin, and the small injection block 22 is provided with a corresponding locking pin hole. In the initial stage of injection, the locking pin extends and inserts into the locking pin hole, firmly connecting the large injection block 21 and the small injection block 22. When the large injection block 21 moves to the dead point position, its side can touch the preset mechanical trigger mechanism on the wall of the pressure chamber 1. This mechanism drives the locking pin to retract through a connecting rod or hydraulic / pneumatic circuit, thereby disengaging the locking pin from the locking pin hole and realizing the automatic unlocking of the large injection block 21 and the small injection block 22. After unlocking, the push rod of the drive source (e.g., a hydraulic cylinder) continues to act on the rear end face of the small injection block 22, causing it to move forward independently to complete the subsequent stages such as pressurization and pressure holding.

[0099] Through the above technical solution, during the injection process, after the large injection block 21 completes rapid filling, the connecting device 5 can automatically and reliably unlock when the large injection block 21 reaches the dead point position, effectively separating the large injection block 21 from the small injection block 22. This separation mechanism ensures that the small injection block 22 can be independently driven by the drive source for subsequent pressurization, pressure holding, and defect filling operations, avoiding the influence of the inertia of the large injection block 21 on the fine control of the small injection block 22. Therefore, this solution significantly improves the control accuracy and flexibility of the injection process, helps to obtain higher quality die castings, reduces defects, and optimizes the stability of the die casting process.

[0100] For any parts not mentioned in this invention, existing technologies can be used or referenced.

[0101] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0102] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention should be included within the scope of the claims of the present invention.

Claims

1. An injection assembly for a die-casting molding apparatus, comprising a pressure chamber (1) and an injection execution structure, characterized in that, The injection execution structure includes at least one injection execution unit (2). The injection unit (2) moves in a direction perpendicular to the axis of the mold gating system to push the molten liquid in the pressure chamber (1) into the mold cavity (4). The effective working cross-sectional area of ​​the injection execution unit (2) is larger than that of the traditional cylindrical injection punch under the same die-casting machine tonnage, so as to increase the filling flow rate and shorten the injection stroke and time at the same movement speed.

2. The injection assembly of a die-casting molding equipment according to claim 1, characterized in that, The injection unit (2) is a block, plate or column structure with a rectangular, circular or irregular polygonal cross-section.

3. The injection assembly of a die-casting molding equipment according to claim 1, characterized in that, The injection execution structure includes two independent injection execution units (2), the height and width of which are respectively... H i , W i , ( i =1,2), two injection execution units (2) move in parallel and synchronously in the same or opposite directions, and the volume of molten material filled per unit time is DV= H 1 W 1 v 1 + H 2 W 2 v 2 ,in v 1 and v 2 The speeds of the two injection blocks of the injection execution unit (2) are respectively.

4. The injection assembly of a die-casting molding equipment according to claim 3, characterized in that, The cross-sectional area of ​​one of the injection actuators (2) H 1 ×W 1 It has a smaller cross-sectional area than the other injection unit (2) and is used to implement pressurization, pressure holding and filling functions.

5. The injection assembly of a die-casting molding equipment according to claim 1, characterized in that, The injection unit (2) includes a large injection block (21) and a small injection block (22), which can slide relative to each other along the same direction of movement; the large injection block (21) is used for rapid filling, and the small injection block (22) is used for pressurization, pressure holding and filling defects.

6. The injection assembly of a die-casting molding equipment according to claim 5, characterized in that, A detachable connection device (5) is provided between the large injection block (21) and the small injection block (22). After the large injection block (21) reaches the end of its stroke, it is disconnected from the small injection block (22).

7. The injection assembly of a die-casting molding equipment according to claim 2, characterized in that, The injection unit (2) is made of heat-resistant and wear-resistant alloy, and the working surface is nitrided or has a high-temperature wear-resistant coating.

8. The injection assembly of a die-casting molding equipment according to claim 1, characterized in that, The working surface of the injection unit (2) is provided with a flow guide structure or a pressure boosting boss.

9. The injection assembly of a die-casting molding equipment according to claim 1, characterized in that, The inner wall of the pressure chamber (1) and the mating surface of the injection execution unit (2) are precision mating surfaces, with a mating gap of no more than 0.1 mm.

10. The injection assembly of a die-casting molding equipment according to claim 6, characterized in that, The connecting device (5) is one of the following: a locking pin structure, a snap-fit ​​structure, an electromagnetic adsorption structure, or a hydraulic locking structure; when the large injection block (21) reaches the end of its stroke, the connecting device (5) automatically unlocks, allowing the drive source to start driving the small injection block (22) independently.

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