Magnesium alloy profile die-casting die and die-casting method

Abstract

The invention relates to the technical field of automobiles, in particular to a magnesium alloy profile die-casting die and a die-casting method. The technical problems that cracks are generated due to non-uniform cooling of magnesium alloy, and the production quality of a steering wheel is reduced due to overheating of a mold are solved. According to the technical scheme, the die comprises a front die and a rear die, the front die is matched with the rear die, the die further comprises a heat dissipation adjusting unit and the like, and the heat dissipation adjusting unit is located in the front die and the rear die and used for uniform heat dissipation and solidification forming of magnesium alloy melt in a die cavity. The first liquid cooling pipeline and the second liquid cooling pipeline are arranged, and the first liquid cooling pipeline and the second liquid cooling pipeline are staggered front and back, so that cooling liquid in the first liquid cooling pipeline and cooling liquid in the second liquid cooling pipeline can quickly exchange heat, and heat dissipation is more uniform and stable when magnesium alloy melt is cooled and shaped; and the cracking defect caused by non-uniform heat dissipation in the cooling process of the magnesium alloy is avoided.

Description

Technical Field

[0001] The present invention relates to the field of automobile technology, and in particular to a magnesium alloy profile die-casting die and a die-casting method. Background Art

[0002] Die-casting technology is a processing technology that uses high pressure to push molten metal into a mold to 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 demand for lightweighting in the automotive and other fields.

[0003] The steering wheel of an automobile is a common magnesium alloy die-cast part. However, in the existing die-casting process, due to the high solidification shrinkage rate of magnesium alloy, internal stress is easily generated during uneven cooling, resulting in cracks on the steering wheel surface. In addition, the melting point of magnesium alloy is low, and when the die-casting mold is at a high temperature, the effectiveness of the release agent is reduced, thereby reducing the exhaust efficiency of the gas inside the die-casting mold and the elongation of the magnesium alloy. The brittleness of the magnesium alloy increases, making the magnesium alloy die-cast steering wheel more prone to cracking. In this regard, a magnesium alloy profile die-casting mold and a die-casting method that can automatically adjust heat dissipation are provided to improve the quality of magnesium alloy steering wheels produced by the die-casting process, thereby improving the production efficiency of magnesium alloy steering wheels. Summary of the Invention

[0004] In order to overcome the shortcomings of uneven cooling of magnesium alloy causing cracks and overheating of the mold reducing the quality of steering wheel production, the technical problem of the present 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 scheme of the present invention is: a magnesium alloy profile die-casting mold, including a front mold and a rear mold, the front mold and the rear mold are matched, the bottom of the front mold and the rear mold are provided with a liquid guide groove, and the top of the front mold and the rear mold are provided with an exhaust groove, the bottom of the liquid guide groove of the rear mold is penetrated by a liquid inlet groove for the flow of the magnesium alloy melt, and also includes a heat dissipation adjustment unit, a current limiting adjustment unit and an air pressure adjustment unit, the heat dissipation adjustment unit is located inside the front mold and the rear mold, and is used for the magnesium alloy melt to uniformly dissipate heat and solidify in the mold cavity after entering the mold cavity of the front mold and the rear mold, the current limiting adjustment unit is installed on one side of the heat dissipation adjustment unit, and can adjust the heat dissipation effect of the heat dissipation adjustment unit based on the temperature of the coolant inside the heat dissipation adjustment unit, the air pressure adjustment unit is located inside the rear mold, and when the front mold and the rear mold are closed, it is used to adjust the air pressure in the mold cavity between the front mold and the rear mold to adjust the flow of the magnesium alloy melt and suppress cavitation during the molding of the molten magnesium alloy melt, thereby improving the quality of the magnesium alloy profile.

[0006] Preferably, the heat dissipation adjustment unit includes a heat dissipation sliding column, a first slide groove is opened in the front mold, and a second slide groove is opened in the rear mold. The heat dissipation sliding column is sealed and slidably arranged inside the first slide groove of the front mold and the second slide groove of the rear mold, and the first slide groove, the second slide groove and the heat dissipation sliding column are all filled with heat transfer liquid. The heat dissipation sliding column is provided with a first liquid cooling pipe and a second liquid cooling pipe. The first liquid cooling pipe and the second liquid cooling pipe have a rectangular wave structure, and the first liquid cooling pipe and the second liquid cooling pipe have the same shape. The first liquid cooling pipe and the second liquid cooling pipe are staggered front and back, and the first liquid cooling pipe and the second liquid cooling pipe are both filled with coolant.

[0007] Preferably, the heat dissipation adjustment unit also includes a stepped conical tube, which is mirrored on one side of the heat dissipation sliding column, and the mirrored stepped conical tube is respectively connected to one end of the first liquid cooling pipe and the second liquid cooling pipe of the heat dissipation sliding column, and the interior of the stepped conical tube is in a stepped cone shape.

[0008] Preferably, the heat dissipation adjustment unit also includes a hydraulic piston column and a first temperature-sensitive spring. A first piston groove is provided in the front mold, and the first piston groove is connected to the first slide groove of the front mold. A second piston groove is provided in the rear mold, and the second piston groove is connected to the second slide groove of the rear mold. The first piston groove and the second piston groove are both T-shaped. The hydraulic piston column is symmetrically and sealedly slidably arranged in the first piston groove and the second piston groove. The first temperature-sensitive spring is arranged on the hydraulic piston column. The first temperature-sensitive spring located in the first piston groove is fixedly connected to the first piston groove, and the first temperature-sensitive spring located in the second piston groove is fixedly connected to the second piston groove.

[0009] Preferably, the current 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 liquid-cooling pipe and the second liquid-cooling pipe of the heat dissipation sliding column. A sliding groove is provided inside the adjustment tube, and a flow-blocking slider is slidingly provided in a mirror-distributed manner in the sliding groove. Several flow-blocking grooves are provided on one side of the flow-blocking slider, and a cylindrical cavity is provided on the adjacent side of the flow-blocking slider, and 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. The bottom of the sliding groove is fixedly connected to the friction strip. The friction column is in friction contact with the friction strip. The traction spring is fixed in the sliding groove, and one end of the traction spring is fixed to the flow-blocking slider.

[0010] Preferably, the current limiting regulating unit also includes a second temperature-sensitive spring, a shunt pipeline is opened in the regulating tube, the shunt pipeline is connected to the sliding groove, and the second temperature-sensitive spring is fixedly arranged in the sliding groove, and one end of the second temperature-sensitive spring is arranged 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 installed on the front mold through a mounting bracket, the rotating shaft is arranged on the output shaft of the motor, the air pump is installed on the front mold, the air pump is connected to the exhaust groove of the front mold, a T-tube is arranged on the air pump, and the positive pressure valve is installed at one end of the T-tube in a communicating manner.

[0012] Preferably, the air pressure regulating unit further includes a negative pressure valve and a gas cylinder. The negative pressure valve is connectedly installed at the other end of one end of the T-shaped 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 also includes a one-way damping ring, an elastic ratchet, a serrated frame and a resonance plate. The one-way damping ring is sleeved on the rotating shaft, and the one-way damping ring is provided with an elastic ratchet. The serrated frame is provided on the front mold, and the elastic ratchet is engaged with the serrated frame. The serrated frame consists of a serrated ring at the top and a rectangular tube at the bottom, and the resonance plates are symmetrically distributed in the serrated frame.

[0014] Preferably, a magnesium alloy profile die-casting mold and die-casting method include the following steps: 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 a release agent, then starts the die-casting equipment, closes the front mold and the rear mold, starts the motor, and drives the air pump to extract the air from the mold cavity between the front mold and the rear mold, creating a near vacuum environment in the mold cavity; S2: Turn off the motor and stop the air pump. The molten magnesium alloy is poured into the cavity between the front mold and the rear mold through the die-casting equipment. The motor is started again. The output shaft of the motor rotates in the reverse direction to drive the air pump, releasing the inert gas in the gas cylinder into the T-tube. The gas in the T-tube enters the mold cavity. The shaft rotates in the reverse direction through the one-way damping ring, causing the elastic ratchet to strike the serrated frame to vibrate. The resonance plate resonates and transmits the vibration to the front mold, making the magnesium alloy produce a denser lattice structure. S3: The heat of the magnesium alloy melt is transferred to the heat transfer fluid through the front mold and the rear mold respectively. The heat transfer fluid transfers the heat to the first temperature-sensing spring, which controls the thickness of the heat transfer fluid in the first and second chutes through the hydraulic piston column. The heat transfer fluid transfers the heat to the heat dissipation sliding column. S4: Coolant is introduced into the stepped tapered tube. The coolant is accelerated by the tapered structure of the stepped tapered tube and generates eddy currents through the stepped structure of the stepped tapered tube, making the coolant flow more uniform. The coolant absorbs heat and flows to the regulating tube. The coolant flow rate in the regulating tube is accelerated, causing the fan blades to drive the friction column to roll, which in turn causes the choke sliders to move closer together, hindering the continued flow of coolant. The heat of the coolant causes the second temperature-sensing spring to deform, pulling the choke slider back to its original position. S5: After the magnesium alloy melt cools and forms, the staff separates the front mold and the rear mold and removes the die-cast steering wheel.

[0015] Beneficial effects of the present invention: 1. The present invention provides a first liquid cooling pipe and a second liquid cooling pipe, and the first liquid cooling pipe and the second liquid cooling pipe are staggered front and back, so that the coolant in the first liquid cooling pipe and the coolant in the second liquid cooling pipe can quickly exchange heat through the heat dissipation sliding column, so that the temperature of the coolant in the first liquid cooling pipe and the second liquid cooling pipe is more uniform and stable when absorbing heat, so that the heat dissipation of the magnesium alloy melt is more uniform and stable when cooling and shaping, avoiding cracking defects of the magnesium alloy caused by uneven heat dissipation during the cooling process.

[0016] 2. The present invention sets 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 toward the inner wall and generate eddy currents, so that the coolant in the stepped conical tube flows evenly, thereby improving the heat exchange effect of the coolant at the inner walls of the first liquid cooling pipe and the second liquid cooling pipe, and further improving the heat dissipation efficiency of the magnesium alloy melt.

[0017] 3. The present invention provides a flow-blocking slider. When the coolant flow rate in the first liquid-cooling pipe and the second liquid-cooling pipe is too fast, the coolant will quickly turn along the flow-blocking groove when contacting the flow-blocking groove, thereby 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 liquid-cooling pipe and the second liquid-cooling pipe, and improving the heat absorption efficiency of the coolant. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is an overall cutaway schematic diagram of the present invention; Figure 3 Schematic diagram of the structure of the front mold and the rear mold of the present invention; Figure 4 It is a cross-sectional schematic diagram of the heat dissipation sliding column of the present invention; Figure 5 Schematic diagram of the structure of the first liquid cooling pipe and the second liquid cooling pipe of the present invention; Figure 6 Schematic cross-section of the stepped tapered tube of the present invention; Figure 7 It is a structural schematic diagram of the hydraulic piston column of the present invention; Figure 8 Schematic cross-section of the regulating tube of the present invention; Figure 9 This is a schematic structural diagram of the friction column and friction strip of the present invention; Figure 10Schematic diagram of the structure of the air pressure regulating unit of the present invention; Figure 11 It is a schematic cross-sectional view of the sawtooth frame of the present invention.

[0019] The meanings of the reference numerals in the figure are: 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 cone tube, 303_hydraulic piston column, 304_first temperature sensing spring, 4_current limiting adjustment unit, 401_regulating pipe, 4011_sliding groove, 4012_Diversion pipeline, 402_Flow 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_Rotating 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 rack, 511_Resonance plate. DETAILED DESCRIPTION

[0020] The present invention will be further described below with reference to the accompanying drawings and examples. Example 1

[0021] A magnesium alloy profile die casting die, such as Figure 1-Figure 3 As shown, it includes a front mold 1 and a rear mold 2, the front mold 1 and the rear mold 2 cooperate, and the front mold 1 and the rear mold 2 are combined to form a mold cavity. The bottom of the mold surface of the front mold 1 and the rear mold 2 is provided with a liquid guide groove, and the top of the mold surface of the front mold 1 and the rear mold 2 is provided with an exhaust groove. The bottom of the liquid guide groove of the rear mold 2 is penetrated by a liquid inlet groove for the flow of magnesium alloy melt. It also includes a heat dissipation adjustment unit 3, a current 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, and is used for the magnesium alloy melt to enter After the front mold 1 and the rear mold 2 are molded, the magnesium alloy melt can dissipate heat evenly in the mold cavity and solidify into shape. The current limiting regulating unit 4 is installed on one side of the heat dissipation regulating unit 3, and can adjust the heat dissipation effect of the heat dissipation regulating unit 3 based on the temperature of the coolant inside the heat dissipation regulating unit 3. The air pressure regulating 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 magnesium alloy melt and suppress cavitation during the molding of the molten magnesium alloy, thereby improving the quality of the magnesium alloy profile.

[0022] like Figure 2 and Figure 4-Figure 5As shown, the heat dissipation adjustment unit 3 includes two heat dissipation sliding columns 301, a first slide groove 101 is provided in the front mold 1, and a second slide groove 201 is provided in the rear mold 2. The two heat dissipation sliding columns 301 are respectively sealed and slidably connected to the inside of the first slide groove 101 of the front mold 1 and the second slide groove 201 of the rear mold 2, and the first slide groove 101 and the second slide groove 201 and the heat dissipation sliding columns 301 are filled with heat transfer liquid. A first liquid cooling pipe 3011 and a second liquid cooling pipe 3012 are provided in the heat dissipation sliding column 301. The first liquid cooling pipe 3011 and the second liquid cooling pipe 3012 are provided. The 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 front to back. The first liquid cooling pipe 3011 and the second liquid cooling pipe 3012 are both 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 enables the coolant to fully absorb the heat from the magnesium alloy melt, ensuring uniform heat dissipation of the magnesium alloy melt.

[0023] like Figure 4-Figure 6 As shown, the heat dissipation regulating unit 3 also includes a stepped conical tube 302, which is fixed to one side of the heat dissipation sliding column 301 in a mirror image, and the mirrored stepped conical tube 302 is respectively 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 conical tube 302 is in a stepped cone shape, so that when the coolant enters the stepped conical tube 302, it will be accelerated by the conical structure inside the stepped conical tube 302, thereby improving the heat dissipation efficiency, and the coolant will be guided by the stepped structure inside the stepped conical tube 302 to generate eddy currents, so that the coolant at the center of the stepped conical tube 302 compensates for the coolant on the inner wall of the stepped conical tube 302, and the coolant flows evenly, further improving the heat dissipation efficiency.

[0024] like Figure 7As shown, the heat dissipation regulating unit 3 also includes a hydraulic piston column 303 and a first temperature-sensitive spring 304. A first piston groove 102 is provided in the front mold 1, and the first piston groove 102 is communicated with 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 communicated with 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 connected to the first piston groove 102 and the second piston groove 202. The first temperature-sensitive spring 304 is fixedly connected to the hydraulic piston column 303. The first temperature-sensitive spring 304 located in the first piston groove 102 is fixedly connected to the first piston groove 102, and the first temperature-sensitive spring 304 located in the second piston groove 202 is fixedly connected to the second piston groove 202. When the temperature of the heat-conducting fluid changes, the first temperature-sensitive spring 304 will control the position of the hydraulic piston column 303 in the first piston groove 102 and the second piston groove 202.

[0025] like Figure 8-Figure 9 As shown, the current limiting regulating unit 4 includes a regulating tube 401, a choke slider 402, a fan blade 403, a friction column 404, a friction strip 405 and a pulling spring 406. The regulating tube 401 is 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 in a mirror distribution. A sliding groove 4011 is provided inside the regulating tube 401, and the choke slider 402 is slidingly connected in a mirror distribution in the sliding groove 4011. One side of the choke slider 402 is provided with a plurality of choke grooves, and the adjacent side of the choke slider 402 is provided with a cylindrical cavity, and the fan blade 403 is rotatably connected in the cylindrical cavity. The bottom of the fan blade 403 passes through the choke slider 402 and is fixed to the friction column 404. The bottom of the sliding groove 4011 is fixed to the friction strip 405. The friction column 404 is in friction contact with the friction strip 405, and the pulling spring 406 is fixed to the sliding groove. In 4011, one end of the pulling spring 406 is fixedly connected to the choke slider 402. When the flow velocity of the coolant in the regulating tube 401 increases, it will impact and drive the fan blade 403 to rotate, so that the fan blade 403 drives the friction column 404 to roll on the friction strip 405, so that the friction column 404 drives the choke slider 402 to approach each other in the sliding groove 4011 through the fan blade 403. The choke sliders 402 approaching each other will reduce the flow cross-sectional area of ​​the coolant in the regulating tube 401, thereby increasing the flow velocity of the coolant. At the same time, when the coolant contacts the choke groove of the choke slider 402, it will quickly turn along the choke groove to generate 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 liquid cooling pipe 3011 and the second liquid cooling pipe 3012, and improving the heat absorption efficiency of the coolant.

[0026] like Figure 8-Figure 9As shown, the current limiting regulating unit 4 also includes a second temperature-sensitive spring 407, a shunt pipe 4012 is opened in the regulating tube 401, the shunt pipe 4012 is communicated with the sliding groove 4011, and the second temperature-sensitive spring 407 is fixed in the sliding groove 4011, and one end of the second temperature-sensitive spring 407 is fixed on the choke slider 402. On the one hand, the choke sliders 402 approach each other to stretch the pulling spring 406 and the second temperature-sensitive spring 407. When the coolant contacts the choke groove of the choke slider 402, turbulence is generated, which slows down the accelerated flow of the coolant. The increase in the force of the coolant impacting the fan blade 403 gradually slows down, thereby gradually slowing down the increase in the driving force of the choke sliders 402 approaching each other. The change in the driving force applied to the choke slider 402 is slower than the change in the elastic force of the pulling spring 406 and the second temperature-sensitive spring 407. The elastic force of the pulling spring 406 and the second temperature-sensitive spring 407 will eventually be balanced with the driving force applied to the choke slider 402, so that the heat absorption efficiency of the coolant is always in an optimal state. On the other hand, when the coolant temperature rises, the coolant enters the sliding groove 4011 through the bypass pipe 4012, so that the temperature of the coolant controls the expansion and contraction state of the second temperature-sensitive spring 407, so that the choke sliders 402 move away from each other when the coolant temperature is high, reducing the flow obstruction of the coolant by the choke slider 402 and ensuring the stability of the coolant's heat dissipation of the magnesium alloy melt.

[0027] 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 installed on the front mold 1 through a mounting bracket, the rotating shaft 502 is fixedly connected to the output shaft of the motor 501, the air pump 503 is installed on the front mold 1, and the air pump 503 is connected to the exhaust groove of the front mold 1. A T-tube 504 is fixedly connected to the air pump 503 in a communicating manner, and the positive pressure valve 505 is connected to one end of the T-tube 504. When the air pressure in the T-tube 504 is higher than a certain external pressure, the gas in the T-tube 504 can be discharged to the outside through the positive pressure valve 505.

[0028] 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 connectedly installed at 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.

[0029] like Figure 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 resonance plate 511. The one-way damping ring 508 is sleeved on the rotating shaft 502. When the rotating shaft 502 rotates clockwise, it will not be affected by the damping of the one-way damping ring 508. When the rotating shaft 502 rotates counterclockwise, the damping of the one-way damping ring 508 will drive the one-way damping ring 508 to rotate synchronously. The one-way damping ring 508 is fixed with an elastic The ratchet 509 and the serrated frame 510 are fixed on the front mold 1, and the elastic ratchet 509 is engaged with the serrated frame 510. The serrated frame 510 consists of a serrated ring at the top and a rectangular tube at the bottom. The resonance plates 511 are symmetrically distributed and fixed in the serrated frame 510. When the elastic ratchet 509 strikes the serrated frame 510 to generate vibration, the resonance plates 511 can amplify the vibration effect, thereby causing the front mold 1 to vibrate slightly, reducing the pores generated by the magnesium alloy melt during cooling and forming.

[0030] A magnesium alloy profile die-casting die and die-casting method, comprising 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 a 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 from 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, stopping the air pump 503. The molten magnesium alloy is poured into the mold cavity between the front mold 1 and the rear mold 2 through the die-casting equipment. The motor 501 is restarted, and the output shaft of the motor 501 rotates in the reverse direction to drive the air pump 503 to work, releasing the inert gas in the gas cylinder 507 into the T-tube 504. The gas in the T-tube 504 enters the mold cavity. The rotating shaft 502 rotates in the reverse direction, causing the elastic ratchet 509 to strike the sawtooth frame 510 through the one-way damping ring 508 to vibrate. The resonance plate 511 resonates and transmits the resonance to the front mold 1, so that the magnesium alloy has a denser lattice structure. S3: The heat of the magnesium alloy melt is transferred to the heat transfer fluid through the front mold 1 and the rear mold 2. The heat transfer fluid transfers the heat to the first temperature-sensing spring 304. The first temperature-sensing spring 304 controls the thickness of the heat transfer fluid in the first chute 101 and the second chute 201 through the hydraulic piston column 303. The heat transfer fluid transfers the heat to the heat dissipation sliding column 301. S4: Coolant is introduced into the stepped tapered tube 302. The coolant is accelerated by the tapered structure of the stepped tapered tube 302 and generates eddy currents through the stepped structure of the stepped tapered 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 in the regulating tube 401 is accelerated, causing the fan blades 403 to drive the friction column 404 to roll, thereby causing the flow control sliders 402 to move closer to each other, hindering the continued flow of the coolant. The heat of the coolant causes the second temperature-sensing spring 407 to deform, pulling the flow control slider 402 to return to its original position. S5: After the magnesium alloy melt is cooled and formed, the staff separates the front mold 1 and the rear mold 2 and removes the die-cast steering wheel.

[0031] In the initial state, the staff installs the front mold 1 and the rear mold 2 on the die-casting equipment, and connects the water pump to the stepped cone pipe 302 through one of the water pipes, and connects the recovery tank to the regulating pipe 401 through another water pipe. When it is necessary to die-cast magnesium alloy, the staff preheats the front mold 1 and the rear mold 2 and applies a release agent, then starts the die-casting equipment, closes the front mold 1 and the rear mold 2, and then starts the motor 501 to drive the rotating shaft 502 to rotate clockwise. On the one hand, the rotating shaft 502 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 air flows into the air pump 503 through the exhaust grooves of the front mold 1 and the rear mold 2 and is transported 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 starting threshold of the positive pressure valve 505, the gas inside the T-tube 504 will pass through the positive pressure valve 505 and flow to the outside, thereby gradually reducing the air pressure in the mold cavity 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 in the serration frame 510, and the rotating shaft 502 will not be 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 serration frame 510, so that the one-way damping ring 508 and the elastic ratchet 509 remain stationary.

[0032] When the air pressure in the cavity between the front mold 1 and the rear mold 2 is in a near vacuum state, the staff turns off the motor 501 and stops the air pump 503. Then, the staff uses the die-casting equipment to quickly pour the 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 magnesium alloy melt fills the mold cavity. Among them, the near-vacuum environment in the mold cavity will greatly reduce the air entrained by the magnesium alloy when it flows in the mold cavity, so that the volume of the air is not enough to generate pores during the forming process of the magnesium alloy melt, thereby avoiding the generation of pore defects in the magnesium alloy during cooling and forming. , to ensure the quality of the parts after the magnesium alloy melt is cooled and formed; after the magnesium alloy melt is completely injected into the mold cavity between the front mold 1 and the rear mold 2, the staff restarts the motor 501, and the output shaft of the motor 501 is reversed, so that the motor 501 drives the rotating shaft 502 to reverse. On the other hand, the rotating shaft 502 reverses to drive the air pump 503 to work, so that the air pump 503 extracts a small amount of air in the T-tube 504 into the inside of the air pump 503, and delivers 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 is equal to that in the gas cylinder 507, the air pressure in the T-tube 504 decreases. When the pressure difference between the two reaches the threshold of the negative pressure valve 506, the inert gas in the gas cylinder 507 is released, so that the inert gas passes through the negative pressure valve 506 and enters the T-tube 504, and is transported to the mold cavity between the front mold 1 and the rear mold 2 through the gas pump 503. The high-pressure inert gas further compresses the small amount of gas entrained in the magnesium alloy melt due to the flow, thereby further reducing the volume of the gas, further suppressing the pore volume generated by the magnesium alloy melt during cooling and forming, and avoiding the generation of pore defects in the magnesium alloy melt during cooling and forming. On the other hand, the reversal of the shaft 502 will drive the one-way damping ring 50 8 rotates, so that the one-way damping ring 508 drives the elastic ratchet 509 to strike the teeth of the sawtooth frame 510, causing the sawtooth frame 510 to vibrate. The vibration of the sawtooth frame 510 will be transmitted to the front mold 1 and the resonance plate 511. After being vibrated, the resonance plate 511 will amplify the vibration effect of the sawtooth frame 510 on the front mold 1, causing the front mold 1 to vibrate slightly. The vibration of the front mold 1 will produce smaller magnesium alloy grains in the process of cooling and forming the magnesium alloy solution, so that the magnesium alloy solution will produce a denser lattice structure in the cooling process, thereby enhancing the structural strength of the steering wheel made by die casting.

[0033] When the magnesium alloy melt is cooled and formed in the mold cavity between the front mold 1 and the rear mold 2, the heat of the magnesium alloy melt is transferred to the heat-conducting liquid in the first chute 101 and the second chute 201 through the front mold 1 and the rear mold 2 respectively, and then the heat is transferred to the heat dissipation sliding column 301. At this time, the water pump is started to make the water pump pass 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, and then flows into the recovery pool through another water pipe, realizing the cooling of the magnesium alloy melt by the coolant. In the above process, when the coolant enters the stepped cone tube 302, the conical 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 step of 02 is attracted by the accelerated flowing coolant, and the coolant at the internal step of the stepped cone tube 302 gradually decreases. The coolant at the center of the stepped cone tube 302 will be replenished to the internal step of the stepped cone tube 302, thereby colliding with the inner wall of the stepped cone tube 302 to generate vortexes. Under the influence of the replenishment of coolant at the internal step of the stepped cone tube 302 and the vortexes at the inner wall of the stepped cone tube 302, the coolant in the stepped cone tube 302 flows evenly, so that when the coolant enters the first liquid cooling pipe 3011 and the second liquid cooling pipe 3012 of the heat dissipation sliding column 301, the flow rate at the inner wall of the first liquid cooling pipe 3011 and the second liquid cooling pipe 3012 is suppressed to be slow, while the flow rate at the center of the first liquid cooling pipe 3011 and the second liquid cooling pipe 3012 is fast, thereby improving 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 improving the heat dissipation efficiency of the magnesium alloy melt.

[0034] After the coolant enters the first liquid cooling pipe 3011 and the second liquid cooling pipe 3012, the coolant flows horizontally in opposite directions in the first liquid cooling pipe 3011 and the second liquid cooling pipe 3012. The liquid inlet end of the first liquid cooling pipe 3011 is close to the liquid outlet end of the second liquid cooling pipe 3012, and the liquid outlet end of the first liquid cooling pipe 3011 is close to the liquid inlet end of the second liquid cooling pipe 3012. The front-to-back staggered structure of the first liquid cooling pipe 3011 and the second liquid cooling pipe 3012 enables the coolant in the first liquid cooling pipe 3011 and the coolant in the second liquid cooling pipe 3012 to quickly exchange heat through the heat dissipation sliding column 301 therebetween, thereby making 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, thereby making the heat dissipation more uniform and stable when the magnesium alloy melt is cooled and formed, avoiding cracking defects of the magnesium alloy caused by uneven heat dissipation during the cooling process.

[0035] 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 in the first liquid cooling pipe 3011 and the second liquid cooling pipe 3012, thereby reducing the heat absorption efficiency of the coolant. In this regard, when the coolant flows into the regulating pipe 401, the coolant will impact and drive the fan blade 403 to rotate, so that the fan blade 403 drives the friction column 404 to roll on the friction strip 405, so that the friction column 404 drives the flow blocking slider 402 to approach each other in the sliding groove 4011 through the fan blade 403, and the flow blocking slider 402 approaching each other stretches the pulling spring 406 and the second temperature sensing spring 407, and reduces the cooling The flow cross-sectional area of ​​the coolant in the regulating tube 401 is reduced. The faster the coolant flow rate is, the greater the driving force on the blocking slider 402 is. The closer the distance between the blocking sliders 402 is, the smaller the flow cross-sectional area of ​​the coolant in the regulating tube 401 is, which increases the flow rate of the coolant between the blocking sliders 402. It is worth noting that the closer the distance between the blocking sliders 402 is, the more blocking grooves of the blocking sliders 402 are exposed in the sliding grooves 4011. When the coolant contacts the blocking grooves of the blocking sliders 402, it quickly turns along the blocking grooves and generates turbulence. The turbulence consumes the kinetic energy of the coolant and slows down the accelerated flow of the coolant. The faster the coolant flow rate is, the stronger the effect of the turbulence in slowing down the accelerated flow of the coolant is, thereby making the blocking sliders 402 The change of the driving force applied to 02 is slower than the change of the elastic force of the pulling spring 406 and the second temperature-sensitive spring 407. The elastic force of the pulling spring 406 and the second temperature-sensitive spring 407 will eventually be balanced with the driving force applied to the flow-blocking slider 402. At this time, the flow rate of the coolant is reduced, so that the coolant stays in the first liquid-cooling pipe 3011 and the second liquid-cooling pipe 3012 for a longer time to absorb heat, so that the heat absorption efficiency of the coolant is always in the best state. In addition, when the coolant temperature is high, the heat absorption efficiency of the coolant will be reduced, and it is necessary to speed up the flow of the coolant in the first liquid-cooling pipe 3011 and the second liquid-cooling pipe 3012. When the coolant flows into the regulating pipe 401, part of the coolant will flow into the shunt pipe In the path 4012, the coolant with a higher temperature at this time will heat the second temperature-sensing spring 407, causing the second temperature-sensing spring 407 to deform due to the heat, thereby pulling the flow-blocking slider 402 to reset and driving the pulling spring 406 to reset. The reset of the flow-blocking slider 402 will reduce the obstruction of the flow-blocking slider 402 to the flow of coolant, thereby increasing the flow speed of the coolant. The increase in the flow speed of the coolant will reduce the heat transfer time between the coolant and the first liquid-cooling pipe 3011 and the second liquid-cooling pipe 3012, thereby increasing the temperature difference between the coolant and the first liquid-cooling pipe 3011 and the second liquid-cooling pipe 3012. The cooling efficiency of the coolant is improved by increasing the temperature difference between the coolant and the first liquid-cooling pipe 3011 and the second liquid-cooling pipe 3012.

[0036] During the magnesium alloy die-casting process, the temperature of the front mold 1 and the rear mold 2 cannot be too high to prevent the magnesium alloy from becoming brittle as a whole due to slow cooling and causing thermal cracking. At the same time, the temperature of the front mold 1 and the rear mold 2 cannot be too low to prevent the magnesium alloy from having uneven temperature and cold cracking during cooling. To this end, when the temperature of the front mold 1 and the rear mold 2 rises, the first temperature-sensitive 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 in response to the temperature, thereby driving the hydraulic piston column 303 to slide in the first piston groove 102 of the front mold 1 and the second piston groove 202 of the rear mold 2, and the hydraulic The end of the hydraulic piston column 303 is closer to the outside world. The movement of the hydraulic piston column 303 will extract the heat-conducting fluid, so that the heat-conducting fluid in the first chute 101 of the front mold 1 enters the first piston groove 102, and the heat-conducting fluid in the second chute 201 of the rear mold 2 enters the second piston groove 202. The heat-conducting fluid in the first chute 101 and the second chute 201 is reduced, thereby driving the heat dissipation sliding column 301 to approach the mold cavity between the front mold 1 and the rear mold 2. At this time, the thickness of the heat-conducting fluid in the first chute 101 and the second chute 201 becomes thinner. It should be noted that the heat conduction effect of the front mold 1 and the rear mold 2 is generally much higher than that of the heat-conducting fluid. Thermal effect, so the thinning of the heat-conducting liquid in the first chute 101 and the second chute 201 will reduce the heat dissipation barrier of the heat-conducting liquid to the magnesium alloy, improve the heat dissipation effect of the front mold 1 and the rear mold 2, and prevent the magnesium alloy from cooling and forming due to slow heat dissipation and thermal cracking; when the temperature of the front mold 1 and the rear mold 2 drops, the first temperature-sensitive 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 in response to the temperature, thereby driving the hydraulic piston column 303 to slide in the first piston groove 102 and the second piston groove 202, and one end of the hydraulic piston column 303 is away from the outside world, and the hydraulic piston column 303 moves It will push the thermal conductive liquid, so that the thermal conductive liquid in the first piston groove 102 of the front mold 1 enters the first slide groove 101, and the thermal conductive liquid in the second piston groove 202 of the rear mold 2 enters the second slide groove 201. The thermal conductive liquid in the first slide groove 101 and the second slide groove 201 increases, and then drives 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 thermal conductive 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, inhibiting the heat dissipation effect of the front mold 1 and the rear mold 2, and preventing the magnesium alloy from dissipating heat too quickly during cooling and forming, resulting in cold cracking.

[0037] After the magnesium alloy melt cools and forms, the staff separates the front mold 1 and the rear mold 2 and removes the die-cast steering wheel, completing the entire die-casting process of the steering wheel.

[0038] It should be understood that this embodiment is only used to illustrate the present invention and is not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall equally within the scope limited by the appended claims of the application.

Claims

1. A magnesium alloy profile die-casting mold, comprising a front mold (1) and a rear mold (2), wherein the front mold (1) and the rear mold (2) cooperate with each other, a liquid guide groove is provided at the bottom of the die-joining surface of the front mold (1) and the rear mold (2), and an exhaust groove is provided at the top of the die-joining surface of the front mold (1) and the rear mold (2), and a liquid inlet groove for the flow of magnesium alloy melt is provided through the bottom of the liquid guide groove of the rear mold (2), characterized in that: The invention also includes a heat dissipation regulating unit (3), a current 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 for uniformly dissipating heat and solidifying the magnesium alloy melt in the mold cavity after the magnesium alloy melt enters the mold cavity of the front mold (1) and the rear mold (2). The current limiting regulating unit (4) is installed on one side of the heat dissipation regulating unit (3) and can adjust the heat dissipation effect of the heat dissipation regulating unit (3) based on the temperature of the coolant inside the heat dissipation regulating unit (3). The air pressure regulating unit (5) is located inside the rear mold (2) and is used for adjusting the air pressure in the mold cavity between the front mold (1) and the rear mold (2) when the front mold (1) and the rear mold (2) are closed, so as to regulate the flow of the magnesium alloy melt and suppress the cavitation phenomenon during the molding of the molten magnesium alloy melt, thereby improving the quality of the magnesium alloy profile.

2. A magnesium alloy profile die-casting die according to claim 1, characterized in that: The heat dissipation regulating unit (3) includes a heat dissipation sliding column (301), a first slide groove (101) is provided in the front mold (1), and a second slide groove (201) is provided in the rear mold (2). The heat dissipation sliding column (301) is sealed and slidably arranged inside the first slide groove (101) of the front mold (1) and the second slide groove (201) of the rear mold (2), and the first slide groove (101) and the second slide groove (201) and the heat dissipation sliding column (301) are all filled with heat conducting liquid. A first liquid cooling pipe (3011) and a second liquid cooling pipe (3012) are provided in the column (301), the first liquid cooling pipe (3011) and the second liquid cooling pipe (3012) are in a rectangular wave structure, and the first liquid cooling pipe (3011) and the second liquid cooling pipe (3012) are in the same shape, the first liquid cooling pipe (3011) and the second liquid cooling pipe (3012) are staggered front to back, and the first liquid cooling pipe (3011) and the second liquid cooling pipe (3012) are both filled with cooling liquid.

3. A magnesium alloy profile die-casting die according to claim 2, characterized in that: The heat dissipation regulating unit (3) further comprises a stepped conical tube (302), which is mirror-imaged and arranged on one side of the heat dissipation sliding column (301), and the mirror-imaged stepped conical tube (302) is respectively 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), and the interior of the stepped conical tube (302) is in a stepped cone shape.

4. A magnesium alloy profile die-casting die according to claim 3, characterized in that: The heat dissipation regulating unit (3) further comprises a hydraulic piston column (303) and a first temperature-sensitive spring (304); a first piston groove (102) is provided in the front mold (1); the first piston groove (102) is communicated with the first slide groove (101) of the front mold (1); a second piston groove (202) is provided in the rear mold (2); the second piston groove (202) is communicated with 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 sealingly slidably arranged in the first piston groove (102) and the second piston groove (202); the first temperature-sensitive spring (304) is arranged on the hydraulic piston column (303); the first temperature-sensitive spring (304) located in the first piston groove (102) is fixedly connected to the first piston groove (102); and the first temperature-sensitive spring (304) located in the second piston groove (202) is fixedly connected to the second piston groove (202).

5. A magnesium alloy profile die-casting die according to claim 4, characterized in that: The current limiting regulating unit (4) comprises a regulating tube (401), a flow-blocking slider (402), a fan blade (403), a friction column (404), a friction strip (405) and a traction spring (406). The regulating tube (401) is arranged in a mirror-image distribution 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 provided inside the regulating tube (401). The flow-blocking slider (402) is slidingly arranged in a mirror-image distribution in the sliding groove (4011). The flow-blocking slider (402) is arranged in a mirror-image distribution. A plurality of choke grooves are provided on one side, a cylindrical cavity is provided on an adjacent side of the choke slider (402), and a fan blade (403) is rotatably connected in the cylindrical cavity, the bottom of the fan blade (403) passes through the choke 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 friction contact, a pulling spring (406) is fixedly arranged in the sliding groove (4011), and one end of the pulling spring (406) is fixedly connected to the choke slider (402).

6. A magnesium alloy profile die-casting die according to claim 5, characterized in that: The current limiting regulating unit (4) further includes a second temperature-sensing spring (407). A shunt pipe (4012) is provided in the regulating tube (401). The shunt pipe (4012) is communicated with the sliding groove (4011). The second temperature-sensing spring (407) is fixedly arranged in the sliding groove (4011). One end of the second temperature-sensing spring (407) is arranged on the flow-blocking slider (402).

7. A magnesium alloy profile die-casting die according to claim 6, characterized in that: The air pressure regulating unit (5) comprises a motor (501), a rotating shaft (502), an air pump (503), a T-shaped tube (504) and a positive pressure valve (505). The motor (501) is mounted on the front mold (1) through a mounting frame. The rotating shaft (502) is arranged on the output shaft of the motor (501). The air pump (503) is mounted on the front mold (1). The air pump (503) is communicated with the exhaust groove of the front mold (1). A T-shaped tube (504) is arranged on the air pump (503) in a communication manner. The positive pressure valve (505) is connected to one end of the T-shaped tube (504).

8. A magnesium alloy profile die-casting die according to claim 7, characterized in that: The air pressure regulating unit (5) further comprises a negative pressure valve (506) and a gas cylinder (507). The negative pressure valve (506) is connectedly mounted at the other end of one end of the T-shaped tube (504). The gas cylinder (507) is mounted on the negative pressure valve (506). The gas cylinder (507) is filled with an inert gas.

9. A magnesium alloy profile die-casting die according to claim 8, characterized in that: The air pressure regulating unit (5) further comprises a one-way damping ring (508), an elastic ratchet (509), a sawtooth frame (510) and a resonance plate (511). The one-way damping ring (508) is sleeved on the rotating shaft (502), the elastic ratchet (509) is provided on the one-way damping ring (508), the sawtooth frame (510) is provided on the front mold (1), and the elastic ratchet (509) is engaged 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, and the resonance plate (511) is symmetrically distributed and provided in the sawtooth frame (510).

10. A magnesium alloy profile die-casting die according to claims 1-9, characterized in that: A magnesium alloy profile die-casting die and die-casting method, comprising 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 a 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 air pump (503), pour the molten magnesium alloy into the mold cavity between the front mold (1) and the rear mold (2) through the die-casting equipment, start the motor (501) again, and the output shaft of the motor (501) reverses to drive the air pump (503) to work, so that the inert gas in the gas cylinder (507) is released into the T-tube (504), and the gas in the T-tube (504) enters the mold cavity. The rotating shaft (502) reverses to make the elastic ratchet (509) knock the sawtooth frame (510) to vibrate through the one-way damping ring (508), and the resonance plate (511) resonates and transmits it 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 chute (101) and the second chute (201) through the hydraulic piston column (303), and the heat-conducting liquid transfers the heat to the heat dissipation sliding column (301); S4: Cooling liquid is introduced into the stepped cone tube (302), and the cooling liquid is accelerated by the conical structure of the stepped cone tube (302), and eddies are generated by the stepped structure of the stepped cone tube (302), so that the cooling liquid flows more evenly, and the cooling liquid absorbs heat and flows to the regulating tube (401). The flow rate of the cooling liquid at the regulating tube (401) is accelerated, so that the fan blades (403) drive the friction column (404) to roll, thereby making the flow blocking sliders (402) approach each other, hindering the continued flow of the cooling liquid, and the cooling liquid is heated so that the second temperature-sensing spring (407) is deformed, pulling the flow blocking slider (402) to reset; S5: After the magnesium alloy melt is cooled and formed, the staff separates the front mold (1) and the rear mold (2) and removes the die-cast steering wheel.

Images