A die-casting mold and die-casting method for magnesium alloy profiles

Abstract

This invention relates to the field of automotive technology, and more particularly to a die-casting mold and method for magnesium alloy profiles. The technical problem addressed by this invention is that uneven cooling of magnesium alloys can cause cracks, and overheating of the mold can reduce the quality of steering wheel production. The technical implementation of this invention includes a front mold and a rear mold, which cooperate with each other. It also includes a heat dissipation adjustment unit located inside the front and rear molds, used to uniformly dissipate heat from the molten magnesium alloy within the mold cavity and solidify. This invention, by setting up a first liquid cooling pipe and a second liquid cooling pipe, which are staggered, allows for rapid heat exchange between the coolant in the first and second liquid cooling pipes. This results in more uniform and stable heat dissipation during the cooling and solidification of the molten magnesium alloy, avoiding cracking defects caused by uneven heat dissipation during the cooling process.

Description

Technical Field

[0001] This invention relates to the field of automotive technology, and in particular to a die-casting mold and die-casting method for magnesium alloy profiles. Background Technology

[0002] Die casting is a process that uses high pressure to push molten metal into a mold and shape it. It is suitable for manufacturing thin-walled parts with complex shapes and is often used to process lightweight materials such as aluminum alloys and magnesium alloys to meet the lightweight requirements of the automotive and other industries.

[0003] Automotive steering wheels are common magnesium alloy die-cast parts. However, in existing die-casting processes, due to the high solidification shrinkage rate of magnesium alloys, internal stress is easily generated when cooling is uneven, leading to cracks on the steering wheel surface. Furthermore, magnesium alloys have a low melting point, and the high temperature of the die-casting mold reduces the effectiveness of the release agent, thereby reducing the efficiency of gas removal inside the die-casting mold and decreasing the elongation of the magnesium alloy. This increases the brittleness of the magnesium alloy, making magnesium alloy die-cast steering wheels more prone to cracking. To address this, a magnesium alloy profile die-casting mold and die-casting method with automatic heat dissipation adjustment are provided to improve the quality of magnesium alloy steering wheels produced by the die-casting process, thereby increasing the production efficiency of magnesium alloy steering wheels. Summary of the Invention

[0004] To overcome the drawbacks of uneven cooling of magnesium alloys causing cracks and overheating of the mold reducing the production quality of steering wheels, the technical problem of this invention is to provide a magnesium alloy profile die-casting mold and die-casting method that can automatically adjust heat dissipation.

[0005] The technical implementation of this invention is as follows: A die-casting mold for magnesium alloy profiles includes a front mold and a rear mold, which cooperate with each other. A liquid guiding groove is provided at the bottom of the mating surface of both the front and rear molds, and an venting groove is provided at the top of the mating surface of both the front and rear molds. A liquid inlet groove for the flow of molten magnesium alloy is provided through the bottom of the liquid guiding groove of the rear mold. The mold also includes a heat dissipation regulating unit, a flow limiting regulating unit, and a pressure regulating unit. The heat dissipation regulating unit is located inside the front and rear molds, and is used to ensure that the molten magnesium alloy can dissipate heat evenly and solidify within the mold cavity after entering the mold cavity. The flow limiting regulating unit is installed on one side of the heat dissipation regulating unit and can adjust the heat dissipation effect of the heat dissipation regulating unit based on the temperature of the coolant inside the heat dissipation regulating unit. The pressure regulating unit is located inside the rear mold and is used to adjust the pressure in the mold cavity between the front and rear molds when the front and rear molds are closed, thereby regulating the flow of molten magnesium alloy and suppressing cavitation during the molding of the molten magnesium alloy, thus improving the quality of the magnesium alloy profile.

[0006] Preferably, the heat dissipation adjustment unit includes a heat dissipation sliding column, a first sliding groove is provided in the front mold, and a second sliding groove is provided in the rear mold. The heat dissipation sliding column is slidably and sealed inside the first sliding groove of the front mold and the second sliding groove of the rear mold. The space between the first and second sliding grooves and the heat dissipation sliding column is filled with heat-conducting liquid. A first liquid cooling pipe and a second liquid cooling pipe are provided inside the heat dissipation sliding column. The first and second liquid cooling pipes have a rectangular wave structure and the first and second liquid cooling pipes have the same shape. The first and second liquid cooling pipes are staggered and are filled with coolant.

[0007] Preferably, the heat dissipation adjustment unit further includes a stepped cone tube, which is mirror-arranged on one side of the heat dissipation sliding column, and the mirrored stepped cone tube is connected to one end of the first liquid cooling pipe and the second liquid cooling pipe of the heat dissipation sliding column, respectively. The interior of the stepped cone tube is stepped cone-shaped.

[0008] Preferably, the heat dissipation adjustment unit further includes a hydraulic piston column and a first temperature-sensing spring. A first piston groove is provided in the front mold and is connected to a first sliding groove of the front mold. A second piston groove is provided in the rear mold and is connected to a second sliding groove of the rear mold. Both the first and second piston grooves are T-shaped. The hydraulic piston column is symmetrically and sealedly slidably disposed in the first and second piston grooves. The first temperature-sensing spring is disposed on the hydraulic piston column. The first temperature-sensing spring located in the first piston groove is fixedly connected to the first piston groove, and the first temperature-sensing spring located in the second piston groove is fixedly connected to the second piston groove.

[0009] Preferably, the flow limiting adjustment unit includes an adjustment tube, a flow-blocking slider, a fan blade, a friction column, a friction strip, and a traction spring. The adjustment tube is mirror-distributed at the other end of the first and second liquid cooling pipes of the heat dissipation sliding column. A sliding groove is opened inside the adjustment tube, and a flow-blocking slider is mirror-distributed and slidably arranged in the sliding groove. Several flow-blocking grooves are opened on one side of the flow-blocking slider, and a cylindrical cavity is opened on the adjacent side of the flow-blocking slider. A fan blade is rotatably connected in the cylindrical cavity. The bottom of the fan blade passes through the flow-blocking slider and is fixedly connected to the friction column. A friction strip is fixedly connected to the bottom of the sliding groove. The friction column and the friction strip are in frictional contact. The traction spring is fixedly connected in the sliding groove, and one end of the traction spring is fixedly connected to the flow-blocking slider.

[0010] Preferably, the flow limiting adjustment unit further includes a second temperature sensing spring, a flow diversion pipe is provided in the adjustment tube, the flow diversion pipe is connected to the sliding groove, and the second temperature sensing spring is fixedly installed in the sliding groove, with one end of the second temperature sensing spring installed on the flow blocking slider.

[0011] Preferably, the air pressure regulating unit includes a motor, a rotating shaft, an air pump, a T-tube, and a positive pressure valve. The motor is mounted on the front mold via a mounting bracket, the rotating shaft is located on the output shaft of the motor, the air pump is mounted on the front mold, the air pump is connected to the exhaust groove of the front mold, a T-tube is connected to the air pump, and a positive pressure valve is connected to one end of the T-tube.

[0012] Preferably, the pressure regulating unit further includes a negative pressure valve and a gas cylinder. The negative pressure valve is connected to one end of the T-tube and the gas cylinder is installed on the negative pressure valve. The gas cylinder is filled with inert gas.

[0013] Preferably, the air pressure regulating unit further includes a one-way damping ring, an elastic ratchet, a sawtooth frame, and a resonant plate. The one-way damping ring is sleeved on the rotating shaft, and the elastic ratchet is provided on the one-way damping ring. The sawtooth frame is provided on the front mold, and the elastic ratchet meshes with the sawtooth frame. The sawtooth frame is composed of a sawtooth ring at the top and a rectangular tube at the bottom. The resonant plates are symmetrically distributed inside the sawtooth frame.

[0014] Preferably, a magnesium alloy profile die-casting mold and die-casting method include the following steps:

[0015] S1: The staff installs the front mold and the rear mold on the die-casting equipment, preheats the front mold and the rear mold and applies the release agent. Then the die-casting equipment is started, the front mold and the rear mold are closed, the motor is started, and the motor drives the air pump to work, so that the air pump extracts the air from the mold cavity between the front mold and the rear mold, and the mold cavity is close to a vacuum environment.

[0016] S2: Turn off the motor to stop the gas pump. Use the die-casting equipment to pour molten magnesium alloy into the cavity between the front and rear molds. Restart the motor. The motor's output shaft reverses to drive the gas pump, releasing the inert gas from the gas cylinder into the T-tube. The gas in the T-tube enters the mold cavity. The rotating shaft reverses to cause the elastic ratchet to strike the sawtooth frame and vibrate through the one-way damping ring. The resonant plate resonates and transmits the vibration to the front mold, resulting in a denser lattice structure in the magnesium alloy.

[0017] S3: The heat of the magnesium alloy melt is transferred to the heat-conducting liquid through the front mold and the rear mold respectively. The heat-conducting liquid transfers the heat to the first temperature-sensing spring, so that the first temperature-sensing spring controls the thickness of the heat-conducting liquid in the first slide groove and the second slide groove through the hydraulic piston column. The heat-conducting liquid transfers the heat to the heat dissipation sliding column.

[0018] S4: Coolant is introduced into the stepped cone tube. The coolant is accelerated by the cone-shaped structure of the stepped cone tube and generates vortices through the stepped structure of the stepped cone tube, making the coolant flow more uniform. The coolant absorbs heat and flows to the regulating tube. The increased flow rate of the coolant at the regulating tube causes the fan blades to drive the friction column to roll, thereby causing the flow-blocking sliders to move closer to each other and hinder the continued flow of coolant. The hotter coolant causes the second temperature-sensing spring to deform and pull the flow-blocking sliders to reset.

[0019] S5: After the magnesium alloy melt cools and solidifies, the workers separate the front mold and the rear mold and remove the die-cast steering wheel.

[0020] The beneficial effects of this invention are:

[0021] 1. This invention, by setting up a first liquid cooling pipe and a second liquid cooling pipe, with the first and second liquid cooling pipes staggered, allows the coolant in the first liquid cooling pipe and the coolant in the second liquid cooling pipe to exchange heat quickly through the heat dissipation sliding column. This makes the temperature of the coolant in the first and second liquid cooling pipes more uniform and stable when absorbing heat, thus making the heat dissipation of the magnesium alloy melt more uniform and stable when cooling and shaping, avoiding cracking defects caused by uneven heat dissipation during the cooling process of magnesium alloy.

[0022] 2. By setting a stepped conical tube, when the coolant enters the stepped conical tube, the conical structure inside the stepped conical tube will reduce the flow cross-sectional area of ​​the coolant, thereby accelerating the flow of the coolant. The stepped structure inside the stepped conical tube will guide the coolant to flow towards the inner wall and generate vortices, thereby making the coolant flow uniformly in the stepped conical tube, thereby improving the heat exchange effect of the coolant at the inner wall of the first liquid cooling pipe and the second liquid cooling pipe, and further improving the heat dissipation efficiency of the magnesium alloy melt.

[0023] 3. By setting up a flow-blocking slider, when the coolant flow rate in the first and second liquid cooling pipes is too fast, the coolant will quickly turn along the flow-blocking groove when it comes into contact with the flow-blocking groove of the slider, generating turbulence. The turbulence will consume the kinetic energy of the coolant, slow down the accelerated flow of the coolant, thereby reducing the flow rate of the coolant, increasing the residence time of the coolant in the first and second liquid cooling pipes, and improving the heat absorption efficiency of the coolant. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a schematic cross-sectional view of the entire invention;

[0026] Figure 3 This is a schematic diagram of the structure of the front mold and the rear mold of the present invention;

[0027] Figure 4 This is a cross-sectional schematic diagram of the heat dissipation sliding column of the present invention;

[0028] Figure 5 This is a schematic diagram of the structure of the first liquid cooling pipe and the second liquid cooling pipe of the present invention;

[0029] Figure 6 This is a cross-sectional schematic diagram of the stepped tapered tube of the present invention;

[0030] Figure 7 This is a schematic diagram of the hydraulic piston column of the present invention;

[0031] Figure 8 This is a cross-sectional schematic diagram of the regulating tube of the present invention;

[0032] Figure 9 This is a schematic diagram of the friction column and friction strip of the present invention;

[0033] Figure 10 This is a schematic diagram of the air pressure regulating unit of the present invention;

[0034] Figure 11 This is a cross-sectional schematic diagram of the saw tooth frame of the present invention.

[0035] The meanings of the reference numerals in the figure are as follows: 1_Front mold, 101_First slide groove, 102_First piston groove, 2_Rear mold, 201_Second slide groove, 202_Second piston groove, 3_Heat dissipation adjustment unit, 301_Heat dissipation sliding column, 3011_First liquid cooling pipe, 3012_Second liquid cooling pipe, 302_Stepped tapered tube, 303_Hydraulic piston column, 304_First temperature sensing spring, 4_Flow limiting adjustment unit, 401_Adjusting pipe, 4011_Slide groove 4012_Diverter Pipe, 402_Blocking Slider, 403_Fan Blade, 404_Friction Column, 405_Friction Strip, 406_Tension Spring, 407_Second Temperature Sensing Spring, 5_Air Pressure Regulating Unit, 501_Motor, 502_Shaft, 503_Air Pump, 504_T-tube, 505_Positive Pressure Valve, 506_Negative Pressure Valve, 507_Gas Cylinder, 508_One-Way Damping Ring, 509_Elastic Ratchet, 510_Sawtooth Frame, 511_Resonance Plate. Detailed Implementation

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments. Example 1

[0037] A die-casting mold for magnesium alloy profiles, such as Figures 1-3As shown, the system includes a front mold 1 and a rear mold 2. The front mold 1 and the rear mold 2 mate to form a mold cavity. The bottom of the mating surfaces of both the front mold 1 and the rear mold 2 are provided with liquid guiding grooves, and the top of the mating surfaces of both the front mold 1 and the rear mold 2 are provided with venting grooves. A liquid inlet groove for the flow of molten magnesium alloy is provided through the bottom of the liquid guiding groove of the rear mold 2. The system also includes a heat dissipation regulating unit 3, a flow limiting regulating unit 4, and an air pressure regulating unit 5. The heat dissipation regulating unit 3 is located inside the front mold 1 and the rear mold 2 and is used to regulate the flow of molten magnesium alloy into the mold. After the mold cavities of the front mold 1 and the rear mold 2 are formed, the molten magnesium alloy can dissipate heat evenly and solidify within the mold cavities. The flow limiting adjustment unit 4 is installed on one side of the heat dissipation adjustment unit 3, which can adjust the heat dissipation effect of the heat dissipation adjustment unit 3 based on the temperature of the coolant inside the heat dissipation adjustment unit 3. The air pressure adjustment unit 5 is located inside the rear mold 2. When the front mold 1 and the rear mold 2 are closed, it is used to adjust the air pressure in the mold cavity between the front mold 1 and the rear mold 2 to regulate the flow of the molten magnesium alloy and suppress cavitation during the molding of the molten magnesium alloy, thereby improving the quality of the magnesium alloy profile.

[0038] like Figure 2 and Figures 4-5 As shown, the heat dissipation adjustment unit 3 includes two heat dissipation sliding pillars 301. A first sliding groove 101 is formed in the front mold 1, and a second sliding groove 201 is formed in the rear mold 2. The two heat dissipation sliding pillars 301 are respectively slidably and sealed within the first sliding groove 101 of the front mold 1 and the second sliding groove 201 of the rear mold 2. Both the first and second sliding grooves 101 and the heat dissipation sliding pillars 301 are filled with heat-conducting liquid. A first liquid-cooling pipe 3011 and a second liquid-cooling pipe 3012 are formed within the heat dissipation sliding pillars 301. Pipe 3012 has a rectangular wave structure, and the first liquid cooling pipe 3011 and the second liquid cooling pipe 3012 have the same shape. The first liquid cooling pipe 3011 and the second liquid cooling pipe 3012 are staggered. Both the first liquid cooling pipe 3011 and the second liquid cooling pipe 3012 are filled with coolant. When the heat of the magnesium alloy melt is transferred to the first liquid cooling pipe 3011 and the second liquid cooling pipe 3012, the staggered structure of the first liquid cooling pipe 3011 and the second liquid cooling pipe 3012 allows the coolant to fully absorb the heat from the magnesium alloy melt, ensuring uniform heat dissipation of the magnesium alloy melt.

[0039] like Figures 4-6As shown, the heat dissipation adjustment unit 3 also includes a stepped cone tube 302, which is mirror-fixed to one side of the heat dissipation sliding column 301. The mirror-fixed stepped cone tube 302 is connected to one end of the first liquid cooling pipe 3011 and the second liquid cooling pipe 3012 of the heat dissipation sliding column 301. The interior of the stepped cone tube 302 is stepped cone-shaped, so that when the coolant enters the stepped cone tube 302, it will be accelerated by the cone-shaped structure inside the stepped cone tube 302, thereby improving the heat dissipation efficiency. The coolant will also be guided by the stepped structure inside the stepped cone tube 302 to generate eddies, so that the coolant at the center of the stepped cone tube 302 compensates for the coolant at the inner wall of the stepped cone tube 302. The coolant flows evenly, further improving the heat dissipation efficiency.

[0040] like Figure 7 As shown, the heat dissipation adjustment unit 3 also includes a hydraulic piston column 303 and a first temperature-sensing spring 304. A first piston groove 102 is provided in the front mold 1, and the first piston groove 102 is connected to the first sliding groove 101 of the front mold 1. A second piston groove 202 is provided in the rear mold 2, and the second piston groove 202 is connected to the second sliding groove 201 of the rear mold 2. Both the first piston groove 102 and the second piston groove 202 are T-shaped. The hydraulic piston column 303 is symmetrically and sealedly slidably connected in the first piston groove 102 and the second piston groove 202. The first temperature-sensing spring 304 is fixed to the hydraulic piston column 303. The first temperature-sensing spring 304 located in the first piston groove 102 is fixed to the first piston groove 102. The first temperature-sensing spring 304 located in the second piston groove 202 is fixed to the second piston groove 202. When the temperature of the heat transfer fluid changes, the first temperature-sensing spring 304 will control the position of the hydraulic piston column 303 in the first piston groove 102 and the second piston groove 202.

[0041] like Figures 8-9As shown, the flow-limiting adjustment unit 4 includes an adjustment pipe 401, a flow-blocking slider 402, a fan blade 403, a friction column 404, a friction strip 405, and a tension spring 406. The adjustment pipe 401 is mirror-distributed and fixed to the other end of the first liquid cooling pipe 3011 and the second liquid cooling pipe 3012 of the heat dissipation sliding column 301. A sliding groove 4011 is opened inside the adjustment pipe 401. A flow-blocking slider 402 is mirror-distributed and slidably connected inside the sliding groove 4011. Several flow-blocking grooves are opened on one side of the flow-blocking slider 402. A cylindrical cavity is opened on the adjacent side of the flow-blocking slider 402, and a fan blade 403 is rotatably connected inside the cylindrical cavity. The bottom of the fan blade 403 passes through the flow-blocking slider 402 and is fixedly connected to the friction column 404. A friction strip 405 is fixedly connected to the bottom of the sliding groove 4011. The friction column 404 and the friction strip 405 are in frictional contact. The tension spring 406 is fixedly connected to the sliding groove. Inside 4011, one end of the tension spring 406 is fixed to the flow-blocking slider 402. When the flow rate of the coolant in the regulating pipe 401 increases, it will impact and drive the fan blade 403 to rotate, causing the fan blade 403 to drive the friction column 404 to roll on the friction strip 405. This allows the friction column 404 to drive the flow-blocking slider 402 to move closer to each other in the sliding groove 4011 through the fan blade 403. The close proximity of the flow-blocking sliders 402 will reduce the flow cross-sectional area of ​​the coolant in the regulating pipe 401, increasing the coolant flow rate. At the same time, when the coolant contacts the flow-blocking groove of the flow-blocking slider 402, it will quickly turn along the flow-blocking groove and generate turbulence. The turbulence will consume the kinetic energy of the coolant, slow down the accelerated flow of the coolant, thereby reducing the coolant flow rate and increasing the residence time of the coolant in the first liquid cooling pipe 3011 and the second liquid cooling pipe 3012, thus improving the heat absorption efficiency of the coolant.

[0042] like Figures 8-9As shown, the flow limiting adjustment unit 4 also includes a second temperature-sensing spring 407. A diversion pipe 4012 is provided inside the adjustment pipe 401, which is connected to the sliding groove 4011. The second temperature-sensing spring 407 is fixedly connected to the sliding groove 4011, and one end of the second temperature-sensing spring 407 is fixedly connected to the flow-blocking slider 402. On the one hand, when the flow-blocking sliders 402 move closer to each other, they will stretch the tension spring 406 and the second temperature-sensing spring 407. When the coolant comes into contact with the flow-blocking groove of the flow-blocking slider 402, turbulence will be generated, which will slow down the accelerated flow of the coolant. The acceleration of the force of the coolant impacting the fan blades 403 will gradually slow down, thereby gradually slowing down the acceleration of the driving force of the flow-blocking sliders 402 moving closer to each other. The change in driving force on the flow-blocking slider 402 is slower than the change in elastic force of the tension spring 406 and the second temperature-sensing spring 407. The elastic force of the tension spring 406 and the second temperature-sensing spring 407 will eventually balance with the driving force on the flow-blocking slider 402, so that the heat absorption efficiency of the coolant is always at its best. On the other hand, when the coolant temperature rises, the coolant enters the sliding groove 4011 through the diversion pipe 4012, so that the temperature of the coolant controls the extension and contraction state of the second temperature-sensing spring 407, thereby causing the flow-blocking sliders 402 to move away from each other when the coolant temperature is high, reducing the flow obstruction of the flow-blocking sliders 402 on the flow of the coolant, and ensuring the stability of the coolant's heat dissipation from the magnesium alloy melt.

[0043] like Figure 10 As shown, the air pressure regulating unit 5 includes a motor 501, a rotating shaft 502, an air pump 503, a T-tube 504, and a positive pressure valve 505. The motor 501 is mounted on the front mold 1 via a mounting bracket. The rotating shaft 502 is fixedly connected to the output shaft of the motor 501. The air pump 503 is mounted on the front mold 1 and is connected to the exhaust groove of the front mold 1. The T-tube 504 is fixedly connected to the air pump 503. The positive pressure valve 505 is connected to one end of the T-tube 504. When the air pressure inside the T-tube 504 is higher than a certain external pressure, the gas inside the T-tube 504 can be discharged to the outside through the positive pressure valve 505.

[0044] like Figure 10 As shown, the air pressure regulating unit 5 also includes a negative pressure valve 506 and a gas cylinder 507. The negative pressure valve 506 is connected to the other end of the T-tube 504, and the gas cylinder 507 is installed on the negative pressure valve 506. The gas cylinder 507 is filled with inert gas. When the air pressure in the T-tube 504 is lower than a certain pressure in the gas cylinder 507, the inert gas in the gas cylinder 507 can enter the T-tube 504 through the negative pressure valve 506.

[0045] like Figures 10-11As shown, the air pressure regulating unit 5 also includes a one-way damping ring 508, an elastic ratchet 509, a sawtooth frame 510, and a resonant plate 511. A one-way damping ring 508 is fitted onto the rotating shaft 502. When the rotating shaft 502 rotates clockwise, it is not affected by the damping of the one-way damping ring 508. However, when the rotating shaft 502 rotates counterclockwise, it is driven to rotate synchronously by the damping of the one-way damping ring 508. An elastic... The ratchet 509 and the saw tooth frame 510 are fixedly connected to the front mold 1, and the elastic ratchet 509 meshes with the saw tooth frame 510. The saw tooth frame 510 consists of a saw tooth ring at the top and a rectangular tube at the bottom. The resonant plates 511 are symmetrically distributed and fixedly connected inside the saw tooth frame 510. When the elastic ratchet 509 strikes the saw tooth frame 510 and vibrates, the resonant plates 511 can amplify the vibration effect, thereby causing the front mold 1 to vibrate slightly and reducing the porosity generated by the magnesium alloy melt during cooling and forming.

[0046] A die-casting mold and die-casting method for magnesium alloy profiles, comprising the following steps:

[0047] S1: The staff installs the front mold 1 and the rear mold 2 on the die-casting equipment, preheats the front mold 1 and the rear mold 2 and applies a release agent. Then, the die-casting equipment is started, the front mold 1 and the rear mold 2 are closed, the motor 501 is started, and the motor 501 drives the air pump 503 to work, so that the air pump 503 extracts the air from the mold cavity between the front mold 1 and the rear mold 2, and the mold cavity is close to a vacuum environment.

[0048] S2: Turn off motor 501 to stop gas pump 503 from working. Use the die-casting equipment to pour molten magnesium alloy into the mold cavity between the front mold 1 and the rear mold 2. Start motor 501 again. The output shaft of motor 501 reverses to drive gas pump 503 to work, so that the inert gas in gas cylinder 507 is released into T-tube 504. The gas in T-tube 504 will enter the mold cavity. The rotating shaft 502 reverses to cause elastic ratchet 509 to strike saw tooth frame 510 and vibrate through one-way damping ring 508. Resonant plate 511 resonates and transmits the vibration to front mold 1, so that magnesium alloy produces a denser lattice structure.

[0049] S3: The heat of the magnesium alloy melt is transferred to the heat-conducting liquid through the front mold 1 and the rear mold 2 respectively. The heat-conducting liquid transfers the heat to the first temperature-sensing spring 304, so that the first temperature-sensing spring 304 controls the thickness of the heat-conducting liquid in the first slide groove 101 and the second slide groove 201 through the hydraulic piston column 303. The heat-conducting liquid transfers the heat to the heat dissipation sliding column 301.

[0050] S4: Coolant is introduced into the stepped cone tube 302. The coolant is accelerated by the cone-shaped structure of the stepped cone tube 302 and generates vortices through the stepped structure of the stepped cone tube 302, making the coolant flow more uniform. The coolant absorbs heat and flows to the regulating tube 401. The flow rate of the coolant at the regulating tube 401 increases, causing the fan blade 403 to drive the friction column 404 to roll, thereby causing the flow-blocking sliders 402 to move closer to each other, hindering the continued flow of coolant. The hot coolant causes the second temperature-sensing spring 407 to deform, pulling the flow-blocking sliders 402 to reset.

[0051] S5: After the magnesium alloy melt cools and solidifies, the workers separate the front mold 1 and the rear mold 2 and remove the die-cast steering wheel.

[0052] Initially, the workers install the front mold 1 and the rear mold 2 on the die-casting equipment. A water pump is connected to the stepped cone pipe 302 via one water pipe, and the recycling tank is connected to the regulating pipe 401 via another water pipe. When die-casting magnesium alloy is required, the workers preheat the front mold 1 and the rear mold 2 and apply a release agent. Then, the die-casting equipment is started, and the front mold 1 and the rear mold 2 are closed. The workers then start the motor 501, causing the motor 501 to drive the rotating shaft 502 clockwise. On one hand, the rotating shaft 502 drives the air pump 503 to work, causing the air pump 503 to extract air from the cavity between the front mold 1 and the rear mold 2. This air flows through the exhaust channels of the front mold 1 and the rear mold 2 into the air pump 503 and is then delivered to the T... At the T-tube 504, the air pressure inside the T-tube 504 gradually increases. When the difference between the air pressure inside the T-tube 504 and the external air pressure reaches the activation threshold of the positive pressure valve 505, the gas inside the T-tube 504 will flow through the positive pressure valve 505 to the outside, thereby gradually reducing the mold cavity air pressure between the front mold 1 and the rear mold 2 and approaching a vacuum environment. On the other hand, during the clockwise rotation of the rotating shaft 502, since the elastic ratchet 509 can only rotate unidirectionally within the sawtooth frame 510, and the rotating shaft 502 is not affected by the damping of the one-way damping ring 508 when rotating clockwise, the one-way damping ring 508 will not rotate, and the elastic ratchet 509 is limited by the sawtooth frame 510, so that both the one-way damping ring 508 and the elastic ratchet 509 remain stationary.

[0053] When the air pressure in the cavity between the front mold 1 and the rear mold 2 is in a near-vacuum state, the operator turns off the motor 501 to stop the air pump 503 from working. Then, the operator uses the die-casting equipment to quickly pour molten magnesium alloy into the mold cavity between the front mold 1 and the rear mold 2 through the liquid inlet groove at the bottom of the rear mold 2, so that the molten magnesium alloy fills the mold cavity. The near-vacuum environment in the mold cavity greatly reduces the air entrained when the magnesium alloy flows in the mold cavity, so that the volume of air is insufficient to generate pores during the magnesium alloy molten metal forming process, thus avoiding pore defects in the magnesium alloy during cooling and forming. To ensure the quality of the parts after the magnesium alloy molten metal cools and solidifies, after all the magnesium alloy molten metal is injected into the mold cavity between the front mold 1 and the rear mold 2, the operator restarts the motor 501. The output shaft of the motor 501 reverses, causing the motor 501 to drive the rotating shaft 502 to reverse. On one hand, the rotating shaft 502 reverses and drives the air pump 503 to work, causing the air pump 503 to draw a small amount of air from the T-tube 504 into the air pump 503 and deliver it to the mold cavity between the front mold 1 and the rear mold 2. The air pressure in the T-tube 504 gradually decreases. When the air pressure in the T-tube 504 matches that in the gas cylinder 507... When the pressure difference reaches the threshold of the negative pressure valve 506, the inert gas in the gas cylinder 507 is released, allowing the inert gas to pass through the negative pressure valve 506 and enter the T-tube 504. It is then transported by the gas pump 503 to the mold cavity between the front mold 1 and the rear mold 2. The high-pressure inert gas further compresses the small amount of gas carried by the flow in the molten magnesium alloy, thereby further reducing the volume of this gas and further suppressing the volume of pores generated during the cooling and forming of the molten magnesium alloy, thus preventing pore defects during cooling and forming. On the other hand, the reverse rotation of the rotating shaft 502 will drive the one-way damping ring 50... 8. Rotation causes the one-way damping ring 508 to drive the elastic ratchet 509 to strike the teeth of the saw tooth frame 510, causing the saw tooth frame 510 to vibrate. The vibration of the saw tooth frame 510 is transmitted to the front mold 1 and the resonant plate 511. After being vibrated, the resonant plate 511 amplifies the vibration effect of the saw tooth frame 510 on the front mold 1, causing the front mold 1 to vibrate slightly. The vibration of the front mold 1 causes the magnesium alloy solution to produce smaller magnesium alloy grains during the cooling and forming process, and causes the magnesium alloy melt to produce a denser lattice structure during the cooling process, thereby strengthening the structural strength of the die-cast steering wheel.

[0054] When the molten magnesium alloy cools and solidifies in the cavity between the front mold 1 and the rear mold 2, the heat of the molten magnesium alloy is transferred through the front mold 1 and the rear mold 2 to the heat-conducting liquid in the first slide groove 101 and the second slide groove 201, respectively, and then to the heat dissipation sliding column 301. At this time, the water pump is started, so that the water pump drives the coolant into the stepped cone tube 302 through one of the water pipes. The coolant enters the first liquid cooling pipe 3011 and the second liquid cooling pipe 3012 from the stepped cone tube 302, fully absorbs the heat of the heat dissipation sliding column 301, and flows out at the regulating pipe 401. Then it flows into the recovery tank through another water pipe, realizing the cooling of the molten magnesium alloy by the coolant. In the above process, when the coolant enters the stepped cone tube 302, the cone-shaped structure inside the stepped cone tube 302 will reduce the flow cross-sectional area of ​​the coolant, thereby accelerating the flow of the coolant. Based on the conservation of energy, the accelerated flow of the coolant increases the kinetic energy of the coolant, while the static pressure of the coolant decreases, making the stepped cone tube 302... The coolant at the internal stepped section of the stepped cone tube 302 is attracted by the accelerated flow of coolant, and the coolant at the internal stepped section of the stepped cone tube 302 gradually decreases. The coolant located at the center of the stepped cone tube 302 will replenish the internal stepped section of the stepped cone tube 302, thereby colliding with the inner wall of the stepped cone tube 302 to generate eddies. Under the influence of the replenishment of coolant at the internal stepped section of the stepped cone tube 302 and the eddies at the inner wall of the stepped cone tube 302, the coolant in the stepped cone tube 302 flows evenly. This makes it possible for the coolant to enter the first liquid cooling pipe 3011 and the second liquid cooling pipe 3012 of the heat dissipation sliding column 301, thus suppressing the situation where the flow velocity at the inner wall of the first liquid cooling pipe 3011 and the second liquid cooling pipe 3012 is too slow, while the flow velocity at the center of the first liquid cooling pipe 3011 and the second liquid cooling pipe 3012 is too fast. This improves the heat exchange effect of the coolant at the inner wall of the first liquid cooling pipe 3011 and the second liquid cooling pipe 3012, and further improves the heat dissipation efficiency of the magnesium alloy melt.

[0055] After the coolant enters the first liquid cooling pipe 3011 and the second liquid cooling pipe 3012, the coolant flows in opposite directions in the horizontal direction within the first liquid cooling pipe 3011 and the second liquid cooling pipe 3012. The inlet end of the first liquid cooling pipe 3011 is close to the outlet end of the second liquid cooling pipe 3012, and the outlet end of the first liquid cooling pipe 3011 is close to the inlet end of the second liquid cooling pipe 3012. The staggered structure of the first liquid cooling pipe 3011 and the second liquid cooling pipe 3012 allows the coolant in the first liquid cooling pipe 3011 and the coolant in the second liquid cooling pipe 3012 to exchange heat quickly through the heat dissipation sliding column 301 between them. This makes the temperature of the coolant in the first liquid cooling pipe 3011 and the second liquid cooling pipe 3012 more uniform and stable when absorbing heat, thus making the heat dissipation more uniform and stable when the magnesium alloy melt is cooled and shaped, avoiding cracking defects caused by uneven heat dissipation during the cooling process of the magnesium alloy.

[0056] When the coolant in the first liquid cooling pipe 3011 and the second liquid cooling pipe 3012 flows too fast due to external factors, the coolant cannot fully absorb the heat at the first liquid cooling pipe 3011 and the second liquid cooling pipe 3012, thus reducing the heat absorption efficiency of the coolant. To address this, when the coolant flows into the regulating pipe 401, it impacts and drives the fan blade 403 to rotate. The fan blade 403 then drives the friction column 404 to roll on the friction strip 405. This causes the friction column 404, through the fan blade 403, to drive the flow-blocking slider 402 to move closer together in the sliding groove 4011. The approaching flow-blocking slider 402 stretches the tension spring 406 and the second temperature-sensing spring 407, reducing the cooling... The flow cross-sectional area of ​​the coolant within the regulating pipe 401 is determined by the coolant flow rate. The faster the coolant flow, the greater the driving force on the flow-blocking sliders 402. The closer the flow-blocking sliders 402 are, the smaller the flow cross-sectional area of ​​the coolant within the regulating pipe 401, thus increasing the coolant flow rate between the flow-blocking sliders 402. It is worth noting that the closer the flow-blocking sliders 402 are, the more flow-blocking grooves are exposed within the sliding groove 4011. When the coolant contacts the flow-blocking grooves of the flow-blocking sliders 402, it rapidly turns along the grooves, generating turbulence. This turbulence consumes the kinetic energy of the coolant, slowing down its accelerated flow. The faster the coolant flow, the stronger the effect of turbulence in slowing down the accelerated flow, thus increasing the flow-blocking sliders 402's cross-sectional area. The change in the driving force on the 02 is slower than the change in the elastic force of the tension spring 406 and the second temperature-sensing spring 407. Eventually, the elastic force of the tension spring 406 and the second temperature-sensing spring 407 will balance the driving force on the flow-blocking slider 402. At this point, the coolant flow rate decreases, allowing the coolant to remain in the first liquid-cooling pipe 3011 and the second liquid-cooling pipe 3012 for a longer period to absorb heat, ensuring the coolant's heat absorption efficiency remains at its optimal state. Furthermore, when the coolant temperature is high, the heat absorption efficiency decreases, requiring a faster flow of coolant in the first liquid-cooling pipe 3011 and the second liquid-cooling pipe 3012. When the coolant flows into the regulating pipe 401, some coolant will flow into the distribution pipe. Inside channel 4012, the coolant at a higher temperature heats the second temperature-sensing spring 407, causing it to deform. This deformation pulls the flow-blocking slider 402 back to its original position, which in turn resets the tension spring 406. The reset of the flow-blocking slider 402 reduces its obstruction to the coolant flow, increasing the coolant flow rate. This increased flow rate reduces the heat transfer time between the coolant and the first liquid-cooled pipe 3011 and the second liquid-cooled pipe 3012, thereby increasing the temperature difference between the coolant and these pipes. This increased temperature difference improves the cooling efficiency of the coolant.

[0057] During the die casting process of magnesium alloy, the temperatures of the front mold 1 and the rear mold 2 must not be too high to prevent the magnesium alloy from becoming brittle and cracking due to slow cooling. Simultaneously, the temperatures of the front mold 1 and the rear mold 2 must not be too low to prevent uneven cooling and subsequent cracking. Therefore, when the temperatures of the front mold 1 and the rear mold 2 rise, the first temperature-sensing springs 304 in the first piston groove 102 of the front mold 1 and the second piston groove 202 of the rear mold 2 will deform, thereby driving the hydraulic piston column 303 to slide within the first piston groove 102 of the front mold 1 and the second piston groove 202 of the rear mold 2. As the piston column 303 moves closer to the outside, its movement draws in the heat-conducting fluid, causing the fluid in the first groove 101 of the front mold 1 to enter the first piston groove 102, and the fluid in the second groove 201 of the rear mold 2 to enter the second piston groove 202. This reduces the amount of heat-conducting fluid in the first and second grooves 101, thus driving the heat-dissipating sliding column 301 closer to the cavity between the front mold 1 and the rear mold 2. At this point, the thickness of the heat-conducting fluid in the first and second grooves 101 becomes thinner. It's important to note that the thermal conductivity of the front mold 1 and the rear mold 2 is generally much higher than that of the heat-conducting fluid. The thinning of the heat-conducting fluid in the first groove 101 and the second groove 201 reduces the obstruction of the heat-conducting fluid to the heat dissipation of the magnesium alloy, improving the heat dissipation effect of the front mold 1 and the rear mold 2, and preventing the magnesium alloy from cracking due to slow heat dissipation during cooling and forming. When the temperature of the front mold 1 and the rear mold 2 decreases, the first temperature-sensing spring 304 in the first piston groove 102 of the front mold 1 and the second piston groove 202 of the rear mold 2 will deform due to temperature, thereby driving the hydraulic piston column 303 to slide in the first piston groove 102 and the second piston groove 202. One end of the hydraulic piston column 303 moves away from the outside, and the hydraulic piston column 303 moves. This will push the heat-conducting liquid, causing the heat-conducting liquid in the first piston groove 102 of the front mold 1 to enter the first slide groove 101, and the heat-conducting liquid in the second piston groove 202 of the rear mold 2 to enter the second slide groove 201. The heat-conducting liquid in the first slide groove 101 and the second slide groove 201 increases, thereby driving the heat dissipation sliding column 301 away from the mold cavity between the front mold 1 and the rear mold 2. At this time, the thickness of the heat-conducting liquid in the first slide groove 101 and the second slide groove 201 becomes thicker, thereby hindering the heat dissipation of the magnesium alloy melt during the cooling and forming process, suppressing the heat dissipation effect of the front mold 1 and the rear mold 2, and preventing the magnesium alloy from cooling and forming too quickly, which would lead to cold cracking.

[0058] After the magnesium alloy melt cools and solidifies, the workers separate the front mold 1 and the rear mold 2, and remove the die-cast steering wheel, thus completing the entire die-casting process of the steering wheel.

[0059] It should be understood that this embodiment is for illustrative purposes only and is not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A die-casting mold for magnesium alloy profiles, comprising a front mold (1) and a rear mold (2), the front mold (1) and the rear mold (2) being fitted together, both the bottom of the mating surfaces of the front mold (1) and the rear mold (2) being provided with liquid guiding grooves, and both the top of the mating surfaces of the front mold (1) and the rear mold (2) being provided with venting grooves, the bottom of the liquid guiding groove of the rear mold (2) being provided with a liquid inlet groove for the flow of molten magnesium alloy, characterized in that: It also includes a heat dissipation adjustment unit (3), a flow limiting adjustment unit (4) and an air pressure adjustment unit (5). The heat dissipation adjustment unit (3) is located inside the front mold (1) and the rear mold (2). It is used to ensure that the magnesium alloy melt can dissipate heat evenly and solidify in the mold cavity after entering the mold cavity of the front mold (1) and the rear mold (2). The flow limiting adjustment unit (4) is installed on one side of the heat dissipation adjustment unit (3). It can adjust the heat dissipation effect of the heat dissipation adjustment unit (3) based on the temperature of the coolant inside the heat dissipation adjustment unit (3). The air pressure adjustment unit (5) is located inside the rear mold (2). When the front mold (1) and the rear mold (2) are closed, it is used to adjust the air pressure in the mold cavity between the front mold (1) and the rear mold (2) to adjust the flow of the magnesium alloy melt and suppress the cavitation phenomenon when the molten magnesium alloy melt is formed, thereby improving the quality of the magnesium alloy profile. The heat dissipation adjustment unit (3) includes a heat dissipation sliding column (301). A first groove (101) is provided in the front mold (1), and a second groove (201) is provided in the rear mold (2). The heat dissipation sliding column (301) is slidably disposed inside the first groove (101) of the front mold (1) and the second groove (201) of the rear mold (2). The space between the first groove (101), the second groove (201), and the heat dissipation sliding column (301) is filled with heat-conducting liquid. The column (301) is provided with a first liquid cooling pipe (3011) and a second liquid cooling pipe (3012). The first liquid cooling pipe (3011) and the second liquid cooling pipe (3012) have a rectangular wave structure and the first liquid cooling pipe (3011) and the second liquid cooling pipe (3012) have the same shape. The first liquid cooling pipe (3011) and the second liquid cooling pipe (3012) are staggered. The first liquid cooling pipe (3011) and the second liquid cooling pipe (3012) are both filled with coolant. The heat dissipation adjustment unit (3) also includes a stepped cone tube (302), which is mirrored on one side of the heat dissipation sliding column (301). The mirrored stepped cone tube (302) is connected to one end of the first liquid cooling pipe (3011) and the second liquid cooling pipe (3012) of the heat dissipation sliding column (301), respectively. The interior of the stepped cone tube (302) is stepped cone-shaped. The heat dissipation adjustment unit (3) also includes a hydraulic piston column (303) and a first temperature sensing spring (304). A first piston groove (102) is provided in the front mold (1), and the first piston groove (102) is connected to the first slide groove (101) of the front mold (1). A second piston groove (202) is provided in the rear mold (2), and the second piston groove (202) is connected to the second slide groove (201) of the rear mold (2). The first piston groove (102) and the second piston groove (202) are both T-shaped. The hydraulic piston column (303) is symmetrically and sealedly slidably disposed in the first piston groove (102) and the second piston groove (202). The first temperature sensing spring (304) is disposed on the hydraulic piston column (303). The first temperature sensing spring (304) located in the first piston groove (102) is fixedly connected to the first piston groove (102), and the first temperature sensing spring (304) located in the second piston groove (202) is fixedly connected to the second piston groove (202). The flow-limiting adjustment unit (4) includes an adjustment pipe (401), a flow-blocking slider (402), a fan blade (403), a friction column (404), a friction strip (405), and a traction spring (406). The adjustment pipe (401) is mirror-distributed at the other end of the first liquid cooling pipe (3011) and the second liquid cooling pipe (3012) of the heat dissipation sliding column (301). A sliding groove (4011) is opened inside the adjustment pipe (401), and a flow-blocking slider (402) is mirror-distributed and slidably arranged inside the sliding groove (4011). The flow-blocking slider (402) has its Several flow-blocking grooves are provided on one side of the flow-blocking slider (402). A cylindrical cavity is provided on the adjacent side of the flow-blocking slider (402). A fan blade (403) is rotatably connected in the cylindrical cavity. The bottom of the fan blade (403) passes through the flow-blocking slider (402) and is fixedly connected to a friction column (404). A friction strip (405) is fixedly connected to the bottom of the sliding groove (4011). The friction column (404) and the friction strip (405) are in frictional contact. A traction spring (406) is fixedly installed in the sliding groove (4011). One end of the traction spring (406) is fixedly connected to the flow-blocking slider (402). The flow limiting adjustment unit (4) also includes a second temperature sensing spring (407). A diversion pipe (4012) is provided in the adjustment pipe (401). The diversion pipe (4012) is connected to the sliding groove (4011). The second temperature sensing spring (407) is fixedly installed in the sliding groove (4011). One end of the second temperature sensing spring (407) is installed on the flow blocking slider (402).

2. A magnesium alloy profile die-casting mold according to claim 1, characterized in that: The air pressure regulating unit (5) includes a motor (501), a rotating shaft (502), an air pump (503), a T-tube (504), and a positive pressure valve (505). The motor (501) is mounted on the front mold (1) via a mounting bracket. The rotating shaft (502) is located on the output shaft of the motor (501). The air pump (503) is mounted on the front mold (1) and is connected to the exhaust groove of the front mold (1). The air pump (503) is connected to the T-tube (504), and the positive pressure valve (505) is connected to one end of the T-tube (504).

3. A magnesium alloy profile die-casting mold according to claim 2, characterized in that: The pressure regulating unit (5) also includes a negative pressure valve (506) and a gas cylinder (507). The negative pressure valve (506) is connected to the other end of one end of the T-tube (504), and the gas cylinder (507) is installed on the negative pressure valve (506). The gas cylinder (507) is filled with inert gas.

4. A magnesium alloy profile die-casting mold according to claim 3, characterized in that: The air pressure regulating unit (5) also includes a one-way damping ring (508), an elastic ratchet (509), a sawtooth frame (510), and a resonant plate (511). The one-way damping ring (508) is sleeved on the rotating shaft (502). The one-way damping ring (508) is provided with an elastic ratchet (509). The sawtooth frame (510) is set on the front mold (1), and the elastic ratchet (509) meshes with the sawtooth frame (510). The sawtooth frame (510) is composed of a sawtooth ring at the top and a rectangular tube at the bottom. The resonant plates (511) are symmetrically distributed inside the sawtooth frame (510).

5. A magnesium alloy profile die-casting mold according to claim 4, characterized in that: Includes the following steps: S1: The staff installs the front mold (1) and the rear mold (2) on the die-casting equipment, preheats the front mold (1) and the rear mold (2) and applies release agent, then starts the die-casting equipment, closes the front mold (1) and the rear mold (2), starts the motor (501), and drives the air pump (503) to work, so that the air pump (503) extracts the air in the mold cavity between the front mold (1) and the rear mold (2), and the mold cavity is close to a vacuum environment; S2: Turn off the motor (501) to stop the gas pump (503) from working. Use the die-casting equipment to pour the molten magnesium alloy into the mold cavity between the front mold (1) and the rear mold (2). Start the motor (501) again. The output shaft of the motor (501) reverses to drive the gas pump (503) to work, so that the inert gas in the gas cylinder (507) is released into the T-tube (504). The gas in the T-tube (504) will enter the mold cavity. The rotating shaft (502) reverses to make the elastic ratchet (509) strike the saw tooth frame (510) to vibrate through the one-way damping ring (508). The resonant plate (511) resonates and transmits to the front mold (1), so that the magnesium alloy produces a denser lattice structure. S3: The heat of the magnesium alloy melt is transferred to the heat-conducting liquid through the front mold (1) and the rear mold (2) respectively. The heat-conducting liquid transfers the heat to the first temperature-sensing spring (304), so that the first temperature-sensing spring (304) controls the thickness of the heat-conducting liquid in the first slide (101) and the second slide (201) through the hydraulic piston column (303). The heat-conducting liquid transfers the heat to the heat dissipation sliding column (301). S4: Coolant is introduced into the stepped cone tube (302). The coolant is accelerated by the cone-shaped structure of the stepped cone tube (302) and generates vortices through the stepped structure of the stepped cone tube (302), making the coolant flow more uniform. The coolant absorbs heat and flows to the regulating tube (401). The increased flow rate of the coolant at the regulating tube (401) causes the fan blades (403) to drive the friction column (404) to roll, thereby causing the flow-blocking sliders (402) to move closer to each other, hindering the continued flow of the coolant. The excessive heat of the coolant causes the second temperature-sensing spring (407) to deform, pulling the flow-blocking sliders (402) back to their original position. S5: After the magnesium alloy melt cools and solidifies, the workers separate the front mold (1) and the rear mold (2) and remove the die-cast steering wheel.

Images