Die casting apparatus and method for worm face gear reduction motor housing

Abstract

This invention relates to the field of die casting technology, specifically to a die casting apparatus and method for a worm gear reducer motor housing, including a frame, a mold clamping mechanism, a hydraulic system, a material cylinder, and an injection mechanism. This die casting apparatus and method for a worm gear reducer motor housing integrates a slotted impact platform, a locating and insertable abutment rod, and a spring energy storage structure inside the piston head. Utilizing the slight expansion and contraction allowance reserved in the pusher head, after the workpiece cools and solidifies, a secondary slight displacement of the piston causes the energy-storing impact platform to slide directionally along the abutment rod and strike the pusher head. This effectively loosens the bonding stress between the casting, the material stalk, and the mold without the need for external vibration equipment or manual demolding assistance. Simultaneously, the hemispherical pusher, combined with the forming pot-shaped annular material stalk of the pouring cup, optimizes the force structure of the material stalk, avoiding problems such as housing deformation, material stalk tearing, and micro-cracks in the casting caused by the robotic arm forcibly removing the part. This significantly improves the molding yield of the worm gear reducer motor housing and ensures the structural accuracy and reliability of the housing.

Description

Technical Field

[0001] This invention relates to the field of die casting technology, specifically to a die casting apparatus and method for a worm gear reducer motor housing. Background Technology

[0002] The housing of a worm gear reducer motor is a core load-bearing structural component. Its overall structure is irregular, with multiple gear mounting cavities, sealing grooves, and mounting lugs inside. The housing wall thickness is uneven, and the requirements for molding precision and sealing are stringent, making it a typical complex thin-walled die-casting part. Traditional die-casting processes for this type of housing generally suffer from numerous production drawbacks, severely impacting product quality and production efficiency.

[0003] Firstly, existing die-casting machines mostly use a one-piece injection piston structure, with the piston in constant contact and friction with the inner wall of the barrel throughout the injection process. This results in high frictional resistance and energy consumption during injection. Furthermore, the long-term friction between the piston and the barrel can easily lead to wear gaps, causing unstable injection pressure and resulting in quality defects such as shrinkage cavities, porosity, and incomplete filling in the casting. Simultaneously, during high-speed injection, a small amount of molten metal is prone to adhere to and remain on the inner wall of the barrel. Conventional equipment relies solely on release agent spraying or periodic manual cleaning, which cannot achieve real-time cleaning. Residual molten metal cools and forms hard scale, which, over time, scratches the injection structure and reduces the effective volume of the barrel. This not only reduces the casting accuracy but also shortens the equipment's lifespan, increases maintenance frequency, and raises production costs.

[0004] Secondly, the worm gear reducer motor housing has a complex structure, with a large bonding area and high bonding strength between the casting, the sprue, and the mold cavity. Existing die-casting equipment relies solely on the mold-opening pull force combined with a robotic arm to forcibly remove the casting after molding, lacking an auxiliary demolding and loosening structure. After mold opening, the casting moves with the moving mold; forcibly removing the part easily leads to problems such as sprue tearing, housing edge deformation, and mold sticking and tearing in the cavity, resulting in a low product yield.

[0005] Meanwhile, the tensile stress generated by forcibly removing parts can easily cause micro-cracks inside the casting, reducing the structural strength and service life of the housing, and failing to meet the mass production requirements of high-precision and high-reliability geared motor housings.

[0006] In view of this, we propose a die-casting device and method for the housing of a worm gear reducer motor. Summary of the Invention

[0007] The purpose of this invention is to provide a die-casting device and method for a worm gear reducer motor housing, to solve the problems mentioned in the background art, such as easy scaling of the barrel, unstable injection accuracy, difficulty in demolding complex housing castings, and easy deformation of the parts during removal. To achieve the above objective, this invention provides the following technical solution: a die-casting device for a worm gear reducer motor housing, including a frame, a mold clamping mechanism, a hydraulic system, a barrel, and an injection mechanism. The mold clamping mechanism and the injection mechanism are both mounted on the frame. The mold clamping mechanism includes a fixed mold and a moving mold that open and close with each other. The barrel is fixedly installed on the feeding side of the fixed mold. A sprue cup is embedded in the feeding end of the moving mold. The discharge end of the barrel is axially connected to the sprue cup. The injection mechanism includes an injection piston that is slidably assembled inside the barrel. The tail end of the injection piston is connected to the hydraulic system. A hollow piston head is fixedly provided at the front end of the injection piston. An airtight column is integrally provided at the front end of the injection piston. The airtight column is inserted into and limited inside the piston head to seal the internal cavity of the piston head and achieve gas-tight energy storage.

[0008] The piston head is movably fitted with a pusher, the front end face of which is set as a hemispherical surface. The pusher and the piston head front end are fitted together with a conical surface to achieve precise alignment and sealing.

[0009] The outer wall of the pusher slides against the inner wall of the barrel to form a sealing resistance, and the outer wall of the injection piston is arranged with a gap and no contact with the inner wall of the barrel to reduce friction loss during injection.

[0010] Preferably, a front retaining ring is fixedly embedded in the front end of the piston head, and a core is fixedly connected to the center of the rear end of the pusher head. The core slides through the central through hole of the front retaining ring to achieve stable axial sliding of the pusher head. A stop rod is hinged to the inner end of the core rod, and the stop rod can swing slightly to achieve adaptive alignment.

[0011] Preferably, a rear retaining ring is fixedly embedded in the rear end of the piston head, and a conical ring is fixedly installed between the rear retaining ring and the front retaining ring. The root of the push rod is provided with a conical alignment structure that matches the conical ring, which is used to automatically center and limit the push rod when it slides, so as to ensure the assembly alignment accuracy.

[0012] Preferably, a slidable impact platform is provided inside the piston head, the impact platform is arranged at the rear side of the cone ring, and a slot is provided at the center of the front end of the impact platform. The slot is used for the insertion and positioning of the end of the aligned rod.

[0013] A spring energy storage component is sandwiched between the impact platform and the rear retaining ring. Under normal conditions, the end of the abutment rod abuts against the outside of the front slot of the impact platform. The impact platform can be compressed to compress the spring energy storage component to achieve elastic energy storage, and can slide along the abutment rod axis to apply force after unlocking.

[0014] Preferably, a return spring is assembled between the end faces of the column core and the cone ring, the return spring being used to automatically reset after the push head slides and stores force, ensuring the stability of the equipment's cyclic operation.

[0015] Preferably, both the cone ring and the impact plate are provided with vent holes that communicate with the hollow cavity inside the piston head. The vent holes are used to discharge high-pressure gas from inside the cavity to achieve cleaning of molten residue on the inner wall of the barrel.

[0016] Preferably, the pusher head can slide axially relative to the piston head. When the pusher head is pressing against the pouring cup, a small amount of expansion and contraction gap is reserved between the pusher head and the piston head to provide displacement margin for subsequent unlocking impact of the mechanism.

[0017] Preferably, the impact platform achieves axial limiting and guidance through the slot and the insertion of the push rod, and can slide quickly along the axial direction of the push rod to achieve high-speed impact on the push head, generating vibration to loosen the bonding stress between the casting and the mold and the material handle.

[0018] The method of using the die-casting device for the housing of the worm gear reducer motor includes the following steps:

[0019] S1. After the equipment is started, the mold closing mechanism drives the fixed mold and the moving mold to completely close and lock, injecting a quantitative amount of molten metal into the barrel.

[0020] The hydraulic system drives the injection piston, piston head and push head to move forward as a whole. The outer wall of the push head fits and seals with the inner wall of the barrel, forming a sealed cavity inside the piston head. As the piston moves forward, it compresses the air inside the cavity, completing the gas pre-pressurization and reserving a high-pressure gas source for subsequent self-cleaning purging.

[0021] S2. The injection piston continues to move forward, and the high-pressure gas inside the cavity is released slowly and evenly through the vent holes of the impact platform and the conical ring, as well as the conical fit gap between the pusher and the piston head. The high-speed airflow sweeps the inner wall of the barrel throughout the process, removing the trace amounts of residual melt that adhere to it and preventing cooling and scaling.

[0022] Simultaneously, the pusher head retracts relative to the piston head due to the frictional resistance of the inner wall of the cylinder, causing the core and push rod to move backward synchronously. The push rod, relying on its own weight, droops and abuts against the front face of the impact platform, pushing the impact platform to compress the spring energy storage component to complete independent energy storage and maintain a stable energy storage state. Finally, the pusher head is completely retracted and fits against the front face of the piston head, and the hemispherical pusher head tightly presses against the sprue cup on the moving mold side, smoothly pressing the molten metal into the mold cavity to form a material handle with a pot-shaped annular structure. At this time, the pusher head and the piston head maintain a preset slight expansion and contraction gap and are in a state of energy storage and ready to be triggered.

[0023] S3. Maintain the mold closing and pressure holding state. After the worm gear reducer motor housing has completely cooled and solidified, the hydraulic system controls the injection piston to drive the piston head to make a small secondary feed displacement, releasing the reserved extension and retraction allowance between the pusher head and the piston head.

[0024] The abutment changes position to conform to the conical ring, and is instantly aligned and centered by the conical surface limiting mechanism. Its end precisely inserts into the slot of the impact platform. The alignment and insertion action directly unlocks the stored energy and initiates the impact. The spring energy storage component instantly releases all its elastic potential energy, driving the impact platform to rush forward at high speed along the axis of the aligned and locked abutment, violently impacting the rear end of the pusher head, generating instantaneous high-frequency vibration. This effectively loosens the bonding parts between the casting and the sprue and the moving mold cavity, completing the pre-molding loosening operation.

[0025] S4. After impact and complete energy release, the hydraulic system drives the injection piston to reset as a whole. The return spring pushes the core and the pusher head forward to reset, causing the stop rod to disengage from the locking state of the impact platform. The stop rod returns to its initial standby state of downward contact under its own weight. All components return to their preset standby positions, and the entire machine reset is complete. Subsequently, the mold closing mechanism drives the moving mold to open, and the formed casting moves out synchronously with the moving mold. The robot arm directly and non-destructively picks up the workpiece, completing a single die-casting cycle and entering the next round of continuous production.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] In this invention, by integrating a slotted impact platform, a alignable insertable abutment rod, and a spring energy storage structure inside the piston head, and relying on the slight expansion and contraction allowance reserved in the pusher head, after the workpiece cools and solidifies, a secondary slight displacement of the piston causes the energy-storing impact platform to slide directionally along the abutment rod and strike the pusher head. This effectively loosens the bonding stress between the casting, the sprue, and the mold without the need for external vibration equipment or manual demolding assistance. Simultaneously, the hemispherical pusher, combined with the caster cup forming pot-shaped annular sprue, optimizes the sprue's stress structure, avoiding problems such as shell deformation, sprue tearing, and micro-cracks in the casting caused by the robotic arm forcibly removing the part. This significantly improves the molding yield of the worm gear reducer motor housing and ensures the structural precision and reliability of the housing.

[0028] In this invention, by employing a differentiated structure that uses a pusher to individually contact the barrel to generate sliding resistance and a suspended, non-contact injection piston, the wear and energy consumption of the injection process are significantly reduced. At the same time, by utilizing the method of gas storage and pressurization in the cavity during the early stage of injection and the slow release of airflow during the operation, residual molten material on the inner wall of the barrel is purged in real time. This solves the problems of residual molten material scaling, scratching of components, and injection accuracy deviation in traditional equipment from the root, effectively extending the equipment maintenance cycle and service life, and ensuring the consistency of product accuracy in mass production.

[0029] In this invention, by adopting a step-by-step structure design of energy storage and triggering, the energy storage mechanism in the injection stage only completes the spring energy storage operation; only during the demolding stage after the casting has cooled and solidified, through a secondary micro-displacement of the piston, the stop rod is instantly aligned and unlocked, precisely initiating the impact demolding action. The timing of the actions is unique and precisely controllable. Combined with a return spring, the pusher, core, and stop rod automatically reset, ensuring a continuous and precise cycle of injection, purging, energy storage, impact, and reset. This adapts to automated continuous die casting production, significantly improving the stability and durability of the equipment. Attached Figure Description

[0030] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0031] Figure 2 This is a schematic diagram of the structure of the moving mold and the fixed mold of the present invention;

[0032] Figure 3 This is a schematic diagram of the structure of the pouring cup embedded in the material cylinder of the present invention;

[0033] Figure 4 This is a three-dimensional sectional view of the material cylinder of the present invention;

[0034] Figure 5 This is a three-dimensional sectional view of the piston head of the present invention;

[0035] Figure 6 This is a three-dimensional structural cross-sectional view of the piston head, pusher, front retaining ring, and rear retaining ring of the present invention.

[0036] Figure 7 This is a front sectional view of the piston head, pusher, front retaining ring, and rear retaining ring of the present invention;

[0037] Figure 8 This is an exploded view of the piston head, pusher, front retaining ring, and rear retaining ring of the present invention.

[0038] In the diagram: 1. Frame; 2. Hydraulic system; 3. Barrel; 4. Fixed mold; 5. Moving mold; 6. Sprue cup; 7. Injection piston; 8. Piston head; 9. Airtight column; 10. Pusher head; 11. Front retaining ring; 12. Core; 13. Push rod; 14. Rear retaining ring; 15. Conical ring; 16. Impact platform; 17. Slot; 18. Spring energy storage component; 19. Return spring; 20. Vent hole. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Please see Figures 1 to 8 This invention provides a technical solution: a die-casting device for a worm gear reducer motor housing, comprising a frame 1, a mold clamping mechanism, a hydraulic system 2, a barrel 3, and an injection mechanism. Both the mold clamping mechanism and the injection mechanism are fixedly mounted on the frame 1 to ensure the overall stability of the equipment operation. The mold clamping mechanism includes a fixed mold 4 and a moving mold 5 that can be opened and closed. The barrel 3 is rigidly fixedly installed on the feeding side of the fixed mold 4. A sprue cup 6 is embedded and fixed at the feeding end of the moving mold 5. The discharge end of the barrel 3 is axially aligned and precisely connected with the sprue cup 6 to achieve stable flow and filling of the molten metal.

[0041] The injection mechanism is slidably assembled inside the material cylinder 3, and its tail end is connected to the hydraulic system 2 for transmission. The hydraulic system 2 provides power to realize axial reciprocating sliding and complete the die casting filling operation.

[0042] The front end of the injection piston 7 is integrally formed with an airtight column 9, and a hollow piston head 8 is fixedly installed thereon. The airtight column 9 is inserted and limited to the center of the piston head 8, which can form a sealed effect on the internal cavity of the piston head 8, allowing the cavity to store air and achieve high-pressure pre-pressurization, providing a stable air source for the self-cleaning and purging of the barrel 3. A pusher 10 is movably embedded in the front end of the piston head 8. The front end face of the pusher 10 is set as a hemispherical structure. The outer wall of the pusher 10 and the inner wall of the front end of the piston head 8 are fitted with a conical surface, which can not only ensure accurate sliding alignment between the two, but also improve the sealing performance of the cavity. At the same time, a differentiated friction structure design is adopted, with only the outer wall of the pusher 10 sliding against the inner wall of the barrel 3, forming a sealing sliding resistance, ensuring the injection sealing and pressurization effect. The outer wall of the main body of the injection piston 7 and the inner wall of the barrel 3 are arranged with gaps and no contact friction, which effectively reduces the friction loss and operating energy consumption of the equipment during long-term operation.

[0043] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 8 As shown, a front retaining ring 11 is fixedly embedded in the front end of the piston head 8. The front retaining ring 11 serves as the positioning reference structure for the sliding of the push head 10. A core 12 is fixedly connected to the center of the rear end of the push head 10. The core 12 slides through the central through hole of the front retaining ring 11. Through the limiting and guiding function of the front retaining ring 11, the push head 10 can only slide stably along the axial direction, preventing radial offset and wobbling. A stop rod 13 is hinged to the inner end of the core 12. The stop rod 13 can swing slightly around the hinge point, possessing adaptive alignment adjustment capability. It can adapt to the centering correction requirements of the subsequent conical alignment structure, solving the alignment offset problem caused by assembly errors of the mechanism.

[0044] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 8 As shown, a rear retaining ring 14 is fixedly embedded in the rear end of the piston head 8. The rear retaining ring 14 and the front retaining ring 11 are coaxially arranged, and a conical ring 15 is fixedly installed between them to ensure the coaxiality accuracy of the internal structure. The root of the push rod 13 is provided with a conical alignment structure that matches the conical surface of the inner wall of the conical ring 15. When the push rod 13 slides backward with the core 12, the conical structure at the root can slide against the conical surface of the conical ring 15. Through the conical surface compression and limiting action, the swing deviation of the push rod 13 is automatically corrected, so as to achieve precise centering and alignment of the push rod 13, providing structural guarantee for the subsequent precise insertion and positioning of the push rod 13 and the slot 17 of the impact platform 16.

[0045] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 8 As shown, a striker 16 is slidably fitted inside the piston head 8 and behind the cone ring 15. The striker 16 can slide axially along the internal cavity of the piston head 8. A slot 17 is provided at the center of the front end of the striker 16, and the size of the slot 17 matches the size of the end of the push rod 13. When the equipment is in normal standby mode, the hinged push rod 13 hangs down by its own weight, with its end fitting against the outer end face of the slot 17 at the front end of the striker 16, maintaining a small free swing in standby mode. During the injection operation, the pusher head 10 is compressed and retracts, causing the core 12 and the push rod 13 to move backward synchronously. The end of the push rod 13 presses against the front end face of the striker 16, pushing the striker 16 backward to compress the spring energy storage component 18, completing the elastic energy storage. The spring energy storage component 18 is sandwiched between the striker 16 and the rear retaining ring 14. After the energy storage is completed, the position of the striker 16 is relatively fixed, and the spring energy storage component 18 remains in a compressed energy storage state, and the mechanism is in a state of energy storage and ready to be triggered.

[0046] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 8 As shown, a return spring 19 is assembled between the opposing end faces of the core 12 and the conical ring 15. The return spring 19 is axially sleeved on the outside of the core 12. During the process of the pusher head 10 being compressed and retracting, and the core 12 moving backward, the return spring 19 is simultaneously compressed and stores energy. After a single die-casting operation is completed, the return spring 19 can release its elastic potential energy, pushing the core 12 and the pusher head 10 forward to reset, while simultaneously driving the stop rod 13 and the impact platform 16 back to their initial standby positions, realizing the automatic reset of the entire internal linkage structure, and ensuring the stability and consistency of the equipment's continuous cyclic operation.

[0047] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 8As shown, several vent holes 20 are evenly distributed on the discs of the conical ring 15 and the impact platform 16. All vent holes 20 are connected to the hollow cavity inside the piston head 8, forming a through-flow gas release channel. During the forward movement of the injection piston 7, the sealed cavity inside the piston head 8 is compressed to form high-pressure gas. The high-pressure gas can be slowly released outward through the vent holes 20 on the conical ring 15 and the impact platform 16, in conjunction with the conical contact gap between the pusher head 10 and the piston head 8, forming a high-speed airflow that blows through the inner wall of the barrel 3 throughout the process, removing the trace amounts of molten metal residue in real time, preventing molten metal from cooling and scaling at the source, and ensuring the cleanliness of the barrel 3 and the injection accuracy.

[0048] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 8 As shown, there is an axial sliding allowance between the pusher head 10 and the piston head 8. After the injection molding is completed, the hemispherical front end of the pusher head 10 presses tightly against the end face of the gating cup 6 of the moving mold 5, extruding the molten metal to form a pot-shaped annular material handle. At this time, a small amount of expansion and contraction gap is still reserved between the pusher head 10 and the piston head 8. During the pressure holding and cooling stage, the push rod 13 hangs down under its own weight and abuts against the end face of the impact table 16. The spring energy storage component 18 stably maintains the compressed and stored state, ensuring stable cooling and shaping of the casting.

[0049] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 8 As shown, the insertion and engagement of slot 17 and push rod 13 is the only triggering structure of the impact mechanism. After the workpiece has completely cooled and solidified, the injection piston 7 drives the piston head 8 to make a slight secondary feed displacement, releasing the reserved telescopic gap between the push head 10 and the piston head 8.

[0050] The abutment 13, following the mechanism's displacement, conforms to the conical ring 15, and is instantly aligned and centered by the conical surface limiting mechanism. Its end precisely inserts into the slot 17 of the impact platform 16, completing the insertion and locking, and immediately releasing the limiting constraint of the impact platform 16. The spring energy storage component 18 instantly releases all its elastic potential energy, driving the impact platform 16 to slide forward at high speed along the axial direction of the aligned and locked abutment 13, violently impacting the rear end of the pusher head 10, completing a one-time instantaneous vibration mold loosening operation. This effectively loosens the bonding stress between the casting, the sprue, and the cavity of the moving mold 5, eliminating the problem of mold sticking and jamming. After the impact, the mechanism fully releases its energy, allowing the casting to be smoothly moved out with the moving mold 5, facilitating the robot arm to grasp the workpiece without damage, significantly improving the finished product yield.

[0051] The method of using the die-casting device for the housing of the worm gear reducer motor includes the following steps:

[0052] S1. After the equipment is started, the mold closing mechanism drives the fixed mold 4 and the moving mold 5 to completely close and lock, injecting a quantitative amount of molten metal into the barrel 3.

[0053] The hydraulic system 2 drives the injection piston 7, piston head 8 and push head 10 to move forward as a whole. The outer wall of the push head 10 is sealed to the inner wall of the material cylinder 3, so that the piston head 8 forms a closed cavity. As the piston moves forward, it compresses the air inside the cavity, completing the gas pre-pressurization and reserving a high-pressure gas source for subsequent self-cleaning purging.

[0054] S2. The injection piston 7 continues to move forward. The high-pressure gas inside the cavity is released slowly and evenly through the air vents 20 of the impact platform 16 and the cone ring 15, as well as the conical gap between the pusher 10 and the piston head 8. The high-speed airflow sweeps the inner wall of the barrel 3 throughout the process, removing the trace amounts of residual melt attached to prevent cooling and scaling.

[0055] Simultaneously, the pusher head 10 retracts relative to the piston head 8 due to the frictional resistance of the inner wall of the material cylinder 3, causing the core 12 and the push rod 13 to move backward synchronously. The push rod 13, relying on its own weight, droops and abuts against the front end face of the impact platform 16, pushing the impact platform 16 to compress the spring energy storage component 18 to complete independent energy storage and maintain a stable energy storage state. Finally, the pusher head 10 is completely retracted and fits against the front end of the piston head 8. The hemispherical pusher head 10 tightly presses against the side sprue cup 6 of the moving mold 5, smoothly pressing the molten metal into the mold cavity to form a material handle with a pot-shaped annular structure. At this time, the pusher head 10 and the piston head 8 maintain a preset micro-expansion gap and are in a state of energy storage and ready to be triggered.

[0056] S3. Maintain the mold closing and pressure holding state. After the worm gear reducer motor housing has completely cooled and solidified, the hydraulic system 2 controls the injection piston 7 to drive the piston head 8 to make a small secondary feed displacement, releasing the reserved extension and retraction allowance between the push head 10 and the piston head 8.

[0057] As the displacement changes, the abutment 13 conforms to the conical ring 15, and is instantly aligned and centered by the conical surface limiting. Its end is precisely inserted into the slot 17 of the impact platform 16. The alignment and insertion action directly unlocks the energy storage and initiates the impact. The spring energy storage component 18 instantly releases all its elastic potential energy, driving the impact platform 16 to rush forward at high speed along the axis of the aligned and locked abutment 13, violently impacting the rear end of the push head 10, generating instantaneous high-frequency vibration, effectively loosening the bonding parts between the casting and the sprue and the cavity of the moving mold 5, completing the pre-molding loosening operation.

[0058] S4. After impact and complete energy release, the hydraulic system 2 drives the injection piston 7 to reset as a whole. The return spring 19 pushes the core 12 and the pusher head 10 forward to reset, causing the abutment rod 13 to disengage from the locking state of the impact platform 16. The abutment rod 13 returns to its initial standby state of downward contact under its own weight. All components return to the preset standby position, and the whole machine reset is completed. Subsequently, the mold closing mechanism drives the moving mold 5 to open the mold, and the formed casting moves out synchronously with the moving mold 5. The robot arm directly and non-destructively picks up the workpiece, completing a single die casting cycle and entering the next round of continuous production.

[0059] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A die-casting device for a worm gear reducer motor housing, comprising a frame (1), a mold clamping mechanism, a hydraulic system (2), a barrel (3), and an injection mechanism, wherein the mold clamping mechanism and the injection mechanism are both mounted on the frame (1), the mold clamping mechanism comprises a fixed mold (4) and a moving mold (5) that open and close with each other, the barrel (3) is fixedly installed on the feeding side of the fixed mold (4), the feeding end of the moving mold (5) is fitted with a sprue cup (6), the discharge end of the barrel (3) is axially connected to the sprue cup (6), and the injection mechanism comprises an injection piston (7) slidably mounted inside the barrel (3), the tail end of the injection piston (7) being connected to the hydraulic system (2) for transmission, characterized in that: The front end of the injection piston (7) is fixedly provided with a hollow piston head (8), and the front end of the injection piston (7) is integrally provided with an airtight column (9). The airtight column (9) is inserted into the piston head (8) and is used to seal the internal cavity of the piston head (8) and realize gas-sealed energy storage. The piston head (8) is movably fitted with a pusher (10) at its front end. The front end face of the pusher (10) is set as a hemispherical surface. The pusher (10) and the front end of the piston head (8) are fitted together with a tapered surface. The outer wall of the pusher (10) slides against the inner wall of the barrel (3) to form a sealing resistance, and the outer wall of the injection piston (7) is arranged with a gap and without contact with the inner wall of the barrel (3).

2. The die-casting device for the housing of the worm gear reducer motor according to claim 1, characterized in that: The piston head (8) has a front retaining ring (11) fixedly embedded in its front end. The push head (10) has a core (12) fixedly connected to its rear center. The core (12) slides through the central through hole of the front retaining ring (11) to achieve axial stable sliding of the push head (10). The inner end of the core (12) is hinged with a stop rod (13). The stop rod (13) can swing slightly to achieve adaptive alignment.

3. The die-casting device for the housing of the worm gear reducer motor according to claim 2, characterized in that: The piston head (8) has a rear retaining ring (14) fixedly embedded at its rear end. A conical ring (15) is fixedly installed between the rear retaining ring (14) and the front retaining ring (11). The root of the push rod (13) is provided with a conical alignment structure that matches the conical ring (15) for automatic centering and limiting when the push rod (13) slides.

4. The die-casting device for the housing of the worm gear reducer motor according to claim 3, characterized in that: The piston head (8) is slidably fitted with a striker (16), which is located on the rear side of the cone ring (15). The striker (16) has a slot (17) at the center of its front end, which is used for the insertion and positioning of the end of the aligned push rod (13). A spring energy storage element (18) is sandwiched between the impact platform (16) and the rear retaining ring (14). Under normal conditions, the end of the abutment rod (13) abuts against the outside of the front slot (17) of the impact platform (16). The impact platform (16) can be compressed by the spring energy storage element (18) to achieve elastic energy storage, and can slide along the abutment rod (13) axially after unlocking to apply force.

5. The die-casting device for the housing of the worm gear reducer motor according to claim 4, characterized in that: A reset spring (19) is fitted between the end faces of the core (12) and the cone ring (15), and the reset spring (19) is used to automatically reset the push head (10) after it slides and stores power.

6. The die-casting device for the housing of the worm gear reducer motor according to claim 4, characterized in that: Both the cone ring (15) and the impact platform (16) have ventilation holes (20) that communicate with the hollow cavity inside the piston head (8). The ventilation holes (20) are used to discharge high-pressure gas inside the cavity to clean the molten residue on the inner wall of the barrel (3).

7. The die-casting device for the housing of the worm gear reducer motor according to claim 4, characterized in that: The pusher (10) can slide axially relative to the piston head (8). When the pusher (10) is pressing against the pouring cup (6), a small amount of expansion and contraction gap is reserved between the pusher (10) and the piston head (8) to provide displacement margin for subsequent mechanism unlocking impact.

8. The die-casting device for the housing of the worm gear reducer motor according to claim 7, characterized in that: The impact platform (16) is connected to the push rod (13) through the slot (17) to achieve axial limiting and guidance. It can slide quickly along the axial direction of the push rod (13) to achieve high-speed impact on the push head (10) and generate vibration to loosen the bonding stress between the casting and the mold and the material handle.

9. A method for using a die-casting device for a worm gear reducer motor housing, comprising using the die-casting device for a worm gear reducer motor housing as described in claim 7, characterized in that... Includes the following steps: S1. After the equipment is started, the mold closing mechanism drives the fixed mold (4) and the moving mold (5) to completely close and lock, and injects a quantitative amount of molten metal into the barrel (3); The hydraulic system (2) drives the injection piston (7), piston head (8) and push head (10) to move forward as a whole. The outer wall of the push head (10) is sealed to the inner wall of the barrel (3), so that a sealed cavity is formed inside the piston head (8). As the piston moves forward, it compresses the air inside the cavity, completes the gas pre-pressurization, and reserves a high-pressure gas source for subsequent self-cleaning purging. S2. The injection piston (7) continues to move forward. The high-pressure gas inside the cavity is released slowly and evenly through the air holes (20) of the impact platform (16), the cone ring (15), and the conical gap between the pusher (10) and the piston head (8). The high-speed airflow sweeps the inner wall of the barrel (3) throughout the process, blowing away the trace amount of residual melt attached to prevent cooling and scaling. At the same time, the pusher (10) retracts relative to the piston head (8) due to the frictional resistance of the inner wall of the material cylinder (3), which drives the core (12) and the push rod (13) to move backward synchronously. The push rod (13) hangs down and abuts the front end of the impact platform (16) by its own weight, pushing the impact platform (16) to compress the spring energy storage component (18) to complete independent energy storage and maintain a stable energy storage state. Finally, the pusher (10) is completely retracted and fits against the front end of the piston head (8). The hemispherical pusher (10) presses tightly against the side sprue cup (6) of the moving mold (5) and smoothly presses the molten metal into the mold cavity to form a material handle with a pot-shaped ring structure. At this time, the pusher (10) and the piston head (8) maintain a preset micro-expansion gap and are in a state of energy storage and waiting to be triggered. S3. Keep the mold closed and pressure held. After the worm gear reducer motor housing has completely cooled and solidified, the hydraulic system (2) controls the injection piston (7) to drive the piston head (8) to make a small secondary feed displacement and release the reserved extension allowance between the push head (10) and the piston head (8). The push rod (13) changes with displacement and fits the cone ring (15). It is forced to be aligned and centered instantly by the cone surface limit. The end is precisely inserted into the slot (17) of the impact platform (16). The alignment and insertion action directly unlocks the power storage and starts the impact. The spring energy storage component (18) releases all the elastic potential energy instantly, driving the impact platform (16) to rush forward at high speed along the axis of the aligned and locked push rod (13), violently impacting the rear end of the push head (10), generating instantaneous high-frequency vibration, effectively loosening the bonding parts between the casting and the stalk and the cavity of the moving mold (5), and completing the pre-loosening operation. S4. After impact and mold release, the hydraulic system (2) drives the injection piston (7) to reset as a whole. The reset spring (19) pushes the core (12) and push head (10) forward to reset, causing the push rod (13) to disengage from the locking state of the impact table (16). The push rod (13) returns to its initial standby state of downward contact under its own weight. All components return to the preset standby position. The whole machine reset is completed. Then the mold closing mechanism drives the moving mold (5) to open the mold. The molded casting moves out synchronously with the moving mold (5). The robot directly and non-destructively grabs the workpiece to complete a single die casting cycle and enters the next round of continuous production operation.

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