Magnesium alloy semi-solid die casting molding apparatus
By integrating the slurry supply and die-casting equipment design, the problems of inaccurate metering, oxidation, and heat loss in magnesium alloy product production were solved, achieving efficient and safe semi-solid die-casting molding and improving the strength and elongation of the products.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NINGBO SHUANGMA MASCH IND CO LTD
- Filing Date
- 2025-07-02
- Publication Date
- 2026-07-24
AI Technical Summary
Existing magnesium alloy product manufacturing processes suffer from problems such as low metering accuracy, oxidation of liquid slurry exposed to air, severe heat loss, and high porosity, resulting in low product strength and elongation.
The integrated design of the slurry supply device and the die-casting device includes a slurry preparation mechanism and a quantitative supply mechanism. The preparation and quantitative supply of semi-solid slurry are realized through a sealed connection. Combined with the use of heating and protective gas, the slurry is uniformly heated and protected from oxidation in a fully enclosed environment, forming a continuous integrated production.
It achieves high-precision, low-oxidation, and high-efficiency production of magnesium alloy products, increasing strength by 10% and elongation by 50%, while avoiding the performance loss caused by liquid melting in traditional methods.
Smart Images
Figure CN224543097U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to die casting equipment for magnesium alloy products, and more particularly to a semi-solid die casting equipment for magnesium alloys. Background Technology
[0002] Magnesium alloys are lightweight alloys with low density and high specific strength. They have better heat dissipation and thermal stability than aluminum alloys, making them a promising new type of lightweight alloy material. Currently, they are widely used in aerospace, 3C electronics, and automobile manufacturing.
[0003] Currently, the conventional manufacturing method for magnesium alloy products is die casting. This involves placing raw materials into a furnace to melt them into a slurry, which is then scooped into the injection chamber of a die casting machine using a ladle. The resulting magnesium alloy product is then die-cast. This method has several drawbacks. First, using a ladle to scoop the slurry into the injection chamber results in low measurement accuracy, affecting the precision of the product. Second, the slurry is exposed to air, which is unsafe, leads to significant heat loss, and can cause oxidation before entering the injection chamber. This results in higher porosity in the final die-cast magnesium alloy product, leading to reduced strength and elongation. Summary of the Invention
[0004] The technical problem to be solved by this utility model is to provide a magnesium alloy semi-solid die casting molding equipment with simple structure and easy to produce magnesium alloy products with excellent mechanical properties.
[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:
[0006] A semi-solid die-casting molding equipment for magnesium alloy includes a slurry supply device, a die-casting device, and a molding die with a molding cavity. The slurry is supplied to the die-casting device through the slurry supply device and then pressed into the molding cavity by the die-casting device to form the desired magnesium alloy product. The slurry supply device includes a slurry preparation mechanism and a metering supply mechanism. The slurry preparation mechanism and the die-casting device are sealed together by the metering supply mechanism. The slurry preparation mechanism is used to prepare a semi-solid magnesium alloy slurry from solid raw materials. The semi-solid magnesium alloy slurry prepared by the slurry preparation mechanism is metered and supplied to the die-casting device through the metering supply mechanism.
[0007] The slurry preparation mechanism includes a slurry preparation cylinder with a feed hopper, a sealed slurry preparation chamber inside the slurry preparation cylinder, and the feed hopper connected to the slurry preparation chamber. At least one mixing screw is installed inside the slurry preparation chamber, and a heating mechanism for heating the slurry preparation chamber is installed outside the slurry preparation cylinder. The above-mentioned slurry preparation mechanism has a simple structure. Solid raw materials enter the slurry preparation chamber through the feed inlet, and the screw performs thorough shearing and mixing of the raw materials. Combined with the heating mechanism located outside the slurry preparation cylinder, a more uniform semi-solid slurry can be prepared. Furthermore, the prepared semi-solid slurry does not produce product branching, resulting in better product performance. Depending on the product cycle and weight, multiple sets of screws can be used for slurry preparation.
[0008] The mixing screw has a heating rod at its center. Traditional screws conduct heat primarily from the outside in, resulting in excessively low internal temperatures and uneven heat distribution. By adding a heating rod to the center of the mixing screw, heat can be conducted from the center outwards, combined with external-to-inward heat conduction, ensuring a more even distribution of heat throughout the screw and improving the slurry preparation.
[0009] The slurry preparation cylinder is provided with an exhaust port connected to the slurry preparation chamber, and a one-way valve is installed inside the exhaust port. Air inside the slurry preparation cylinder is discharged outwards through the exhaust port, and the one-way valve ensures that gas can be discharged outwards while preventing outside air from entering, thus facilitating exhaust while preventing external air from entering and causing oxidation of the slurry.
[0010] The slurry preparation cylinder is equipped with an air inlet connected to the slurry preparation chamber for introducing protective gas. A one-way valve is installed inside the air inlet. After the gas inside the slurry preparation cylinder is discharged, protective gas is introduced through the air inlet to provide protection. The air originally remaining inside the slurry preparation cylinder must not be mixed with the protective gas, as this would affect the effectiveness of the protective gas.
[0011] A liquid level sensor is installed at the tail end of the slurry preparation cylinder, and the probe of the liquid level sensor extends into the slurry preparation chamber. The liquid level sensor is used to monitor the liquid level. When the probe of the liquid level sensor senses the liquid level, it means that the liquid level is full, and at this time the mixing screw needs to stop running.
[0012] The quantitative supply mechanism is a quantitative pump. The feed hopper is connected to the upper part of the first end of the slurry preparation chamber, and the discharge port is located at the lower part of the tail end of the slurry preparation chamber. At least one storage cylinder is sealed and connected to the discharge port. The die-casting device has an injection chamber, and the die-casting device is provided with a feed port connected to the injection chamber. A one-way valve is installed in the feed port. The storage cylinder and the feed port are sealed and connected through the quantitative pump. The feed hopper is located at the first end of the slurry preparation chamber, and the discharge port is located at the tail end of the slurry preparation chamber, which facilitates the slurry to be fully sheared and stirred by the screw. The storage cylinder is located at the discharge port, and its volume is designed to be larger than the maximum injection volume of the die-casting device. With the one-way valve, the screw can run continuously to make slurry, improving efficiency. The quantitative supply mechanism is a quantitative pump, which has a simple structure and accurate metering, resulting in higher product precision. For products with large weights, multiple storage cylinders can be connected in parallel to improve production efficiency.
[0013] An induction coil is installed on the outside of the storage cylinder. This is used to prevent the slurry from cooling down and to maintain the temperature. Since there is a lot of material in the storage cylinder, when the machine is stopped and restarted, it is necessary to start melting the material in the storage cylinder. The induction coil heats up quickly and can quickly melt the slurry.
[0014] The die-casting apparatus is externally equipped with a heating device for heating the injection chamber. This device keeps the slurry inside the injection chamber warm, which helps to ensure the performance of the finished product.
[0015] A pressure head is movably disposed within the injection chamber.
[0016] Compared with existing technologies, the advantages of this utility model are: simple structure, realizing semi-solid continuous integrated production throughout the entire process. The entire equipment integrates the mixing, compounding, preparation and control of slurry, quantitative supply of slurry, and die casting into one, forming a continuous and closed operation. From raw materials to finished products, the entire process is in a closed environment, the slurry will not oxidize, heat loss is less, production and manufacturing are safer, and the measurement is more accurate. Moreover, the raw materials do not need to be heated to become liquid throughout the process, avoiding the risk of damage to the chemical bonds inside the metal after the raw materials are completely melted into liquid, which affects the performance of the raw materials. At the same time, the heating time is shortened, making it more energy-efficient and efficient. The final magnesium alloy products can have a 10% increase in strength and a 50% increase in elongation compared with products obtained by traditional die casting processes. Attached Figure Description
[0017] Figure 1 This is a cross-sectional structural diagram of the present invention;
[0018] Figure 2 This is a cross-sectional view of the present invention when the slurry is pressed into the molding cavity. Detailed Implementation
[0019] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.
[0020] As shown in the figure, a semi-solid die-casting molding equipment for magnesium alloy includes a slurry supply device, a die-casting device 1, and a molding die 2 with a molding cavity 21. The slurry is supplied to the pressing device through the slurry supply device and then pressed into the molding cavity 21 by the die-casting device 1 to form the desired magnesium alloy product. The slurry supply device includes a slurry preparation mechanism 3 and a metering supply mechanism 4. The slurry preparation mechanism 3 and the die-casting device 1 are sealed and connected through the metering supply mechanism 4. The slurry preparation mechanism 3 is used to prepare solid raw materials into semi-solid magnesium alloy slurry. The semi-solid magnesium alloy slurry prepared by the slurry preparation mechanism 3 is metered and supplied to the die-casting device 1 through the metering supply mechanism 4.
[0021] In this specific embodiment, the slurry preparation mechanism 3 includes a slurry preparation cylinder 301 with a feed hopper 31. A sealed slurry preparation chamber 32 is provided inside the slurry preparation cylinder 301. The feed hopper 31 is connected to the slurry preparation chamber 32. At least one mixing screw 33 is provided inside the slurry preparation chamber 32. A heating mechanism 34 for heating the slurry preparation chamber 32 is provided outside the slurry preparation cylinder 301. The slurry preparation mechanism 3 has a simple structure. Solid raw materials enter the slurry preparation chamber 32 through the feed inlet 12. The screw fully shears and stirs the raw materials. Combined with the heating mechanism 34 outside the slurry preparation cylinder 301, a more uniform semi-solid slurry can be prepared. Furthermore, the prepared semi-solid slurry does not produce product branching, resulting in better product performance. Depending on the product cycle and weight, multiple sets of screws can be used for slurry preparation.
[0022] In this specific embodiment, a heating rod 331 is provided at the center of the mixing screw 33. Traditional screw structures conduct heat from the outside to the inside, resulting in excessively low internal temperature and uneven heat distribution. By adding a heating rod 331 at the center of the mixing screw 33, heat can be conducted from the center outwards, combined with heat conduction from the outside inwards, allowing the heat of the entire screw to be evenly distributed, resulting in better slurry preparation.
[0023] In this specific embodiment, the slurry preparation cylinder 301 is provided with an exhaust port 35 that communicates with the slurry preparation chamber 32, and a one-way valve 36 is provided inside the exhaust port 35. The air inside the slurry preparation cylinder 301 is discharged to the outside through the exhaust port 35, and the one-way valve 36 allows the gas to be discharged to the outside, but prevents outside air from entering, which is beneficial for exhausting while preventing external air from entering and causing oxidation of the slurry.
[0024] In this specific embodiment, the slurry preparation cylinder 301 is provided with an air inlet 37 for introducing protective gas, which is connected to the slurry preparation chamber 32. A one-way valve 30 is installed inside the air inlet 37. After the gas in the slurry preparation cylinder 301 is discharged, protective gas is introduced through the air inlet 37 to provide protection. The air originally remaining in the slurry preparation cylinder 301 must not be mixed with the protective gas, as this would affect the function of the protective gas.
[0025] In this specific embodiment, a liquid level sensor 38 is provided at the tail end of the slurry preparation cylinder 301, and the probe of the liquid level sensor 38 extends into the slurry preparation chamber 32. The liquid level sensor 38 is used to monitor the liquid level. When the probe of the liquid level sensor 38 senses the liquid level, it means that the liquid level is full, and at this time the mixing screw 33 needs to stop running.
[0026] In this specific embodiment, the quantitative supply mechanism 4 is a quantitative pump. The feed hopper 31 is connected to the upper part of the first end of the slurry preparation chamber 32. The lower part of the tail end of the slurry preparation chamber 32 is provided with a discharge port 39. At least one storage cylinder 5 is sealed and connected to the discharge port 39. The die-casting device 1 has an injection chamber 11. The die-casting device 1 is provided with a feed port 12 that communicates with the injection chamber 11. A one-way valve 13 is provided in the feed port 12. The storage cylinder 5 and the feed port 12 are sealed and connected by the quantitative pump. The feed hopper 31 is located at the beginning of the slurry preparation chamber 32, and the discharge port 39 is located at the end of the slurry preparation chamber 32, which facilitates the slurry to be fully sheared and stirred by the screw. A storage cylinder 5 is installed on the discharge port 39. The volume of the storage cylinder 5 is designed to be larger than the maximum injection volume of the die-casting device 1. With the help of the one-way valve 36, the screw can run continuously to make slurry, improving efficiency. The quantitative supply mechanism 4 is a quantitative pump, which has a simple structure and accurate metering, resulting in higher product precision. For products with large weight, multiple storage cylinders 5 can be connected in parallel to improve production efficiency.
[0027] In this specific embodiment, a temperature control module 501 is provided on the lower discharge section of the storage cylinder 5.
[0028] In this specific embodiment, an induction coil 51 is provided on the outside of the storage cylinder 5. This is used to prevent the slurry from cooling down and to maintain the temperature. Since there is a lot of material in the storage cylinder 5, when the machine is stopped and restarted, it is necessary to start melting the material in the storage cylinder 5. The induction coil 51 heats up quickly and can quickly melt the slurry.
[0029] In this specific embodiment, a heating device 15 is provided outside the die-casting apparatus 1 for heating the injection chamber 11. This device keeps the slurry inside the injection chamber 11 warm, which helps to ensure the performance of the product.
[0030] In this specific embodiment, a pressure head 16 is movably disposed within the injection cavity 11.
[0031] The specific workflow is as follows: The mixing screw 33 rotates, and solid magnesium raw material enters the slurry preparation cylinder 301 from the feed hopper 31. The solid material is sheared by the rotation of the mixing screw 33. Combined with the synchronous heating of the external heating rod and the heating rod in the screw core, the mixture is stirred to form a semi-solid magnesium alloy slurry. The semi-solid magnesium alloy slurry falls into the storage cylinder 5. The metering pump works, the one-way valve 13 opens, and the semi-solid magnesium alloy slurry is transported into the injection chamber 11. During the transportation process, the one-way valve 30 opens and protective gas is introduced to ensure that the slurry can be smoothly input into the injection chamber 11. When the metering pump reaches the metering position, the metering pump stops running, and the pressure head 16 advances slowly. When the pressure head exceeds the feed port 12, the one-way valve 13 closes. Then the pressure head 16 advances at high speed to inject the slurry into the molding die 2 for molding. During the advancement of the pressure head 16, the mixing screw 33 continues to operate without interruption and simultaneously stores materials, causing the liquid level in the storage cylinder 5 to rise. During this process, the one-way valve 36 opens to release the internal gas. When the liquid level in the storage cylinder 5 is detected by the probe of the liquid level sensor 39, the mixing screw 33 stops rotating.
[0032] The following table shows a comparison of the performance data of magnesium alloy products prepared by traditional die casting and those prepared by this magnesium alloy semi-solid die casting equipment:
[0033] .
Claims
1. A magnesium alloy semi-solid die-casting molding equipment, comprising a slurry supply device, a die-casting device, and a molding die having a molding cavity, wherein the slurry is supplied to the die-casting device through the slurry supply device and then pressed into the molding cavity by the die-casting device to form the desired magnesium alloy product, characterized in that... The slurry supply device includes a slurry preparation mechanism and a metering supply mechanism. The slurry preparation mechanism is sealed to the die-casting device through the metering supply mechanism. The slurry preparation mechanism is used to prepare solid raw materials into semi-solid magnesium alloy slurry. The semi-solid magnesium alloy slurry prepared by the slurry preparation mechanism is metered to the die-casting device through the metering supply mechanism.
2. The magnesium alloy semi-solid die-casting molding equipment as described in claim 1, characterized in that... The slurry preparation mechanism includes a slurry preparation cylinder with a feed hopper, a sealed slurry preparation chamber inside the slurry preparation cylinder, the feed hopper being connected to the slurry preparation chamber, at least one mixing screw being installed inside the slurry preparation chamber, and a heating mechanism for heating the slurry preparation chamber being installed outside the slurry preparation cylinder.
3. The magnesium alloy semi-solid die-casting molding equipment as described in claim 2, characterized in that... A heating rod is provided at the center of the mixing screw.
4. The magnesium alloy semi-solid die-casting molding equipment as described in claim 2, characterized in that... The slurry preparation cylinder is provided with an exhaust port that communicates with the slurry preparation chamber, and a one-way valve is provided inside the exhaust port.
5. The magnesium alloy semi-solid die-casting molding equipment as described in claim 2, characterized in that... The slurry preparation cylinder is provided with an air inlet for introducing protective gas, which is connected to the slurry preparation chamber, and a one-way valve is provided in the air inlet.
6. The magnesium alloy semi-solid die-casting molding equipment as described in claim 2, characterized in that... A liquid level sensor is provided at the tail end of the slurry preparation cylinder, and the probe of the liquid level sensor extends into the slurry preparation chamber.
7. The magnesium alloy semi-solid die-casting molding equipment as described in claim 2, characterized in that... The quantitative supply mechanism is a quantitative pump. The feed hopper is connected to the upper part of the first end of the slurry preparation chamber. The lower part of the tail end of the slurry preparation chamber is provided with a discharge port. At least one storage cylinder is sealed and connected to the discharge port. The die-casting device has an injection chamber. The die-casting device is provided with a feed port that communicates with the injection chamber. A one-way valve is provided in the feed port. The storage cylinder and the feed port are sealed and connected through the quantitative pump.
8. The magnesium alloy semi-solid die-casting molding equipment as described in claim 7, characterized in that... An induction coil is provided on the outside of the storage cylinder.
9. The magnesium alloy semi-solid die-casting molding equipment as described in claim 7, characterized in that... The die-casting apparatus is externally equipped with a heating device for heating the injection chamber.
10. The magnesium alloy semi-solid die-casting molding equipment as described in claim 7, characterized in that... A pressure head is movably disposed within the injection chamber.