Knuckle low pressure die casting apparatus and method

Abstract

The application relates to a low-pressure die casting device and method for a steering knuckle, and belongs to the field of automobile accessory machining equipment. The device comprises a die casting machine, a low-pressure air supply part and a holding furnace. A crucible is arranged in the holding furnace, the crucible is connected with the die casting machine through a liquid lifting pipe, an L-shaped placing box is arranged below the holding furnace, the two ends of the placing box are located at the two sides of the holding furnace, a bottom plate is hingedly arranged at the bottom of the holding furnace, the crucible is located on the bottom plate, a clamping mechanism for clamping and driving the crucible to enter and exit the holding furnace in the vertical direction is arranged on the inner wall of the holding furnace; a placing plate is slidably arranged in the placing box and at the two ends of the placing box, one of the placing plates is used for placing the crucible, a moving mechanism for driving the two placing plates to move in the placing box in a straight line is further arranged in the placing box, and cleaning assemblies for cleaning the inner wall of the crucible are further arranged at the two ends of the placing box. The application has the effect of improving the machining efficiency.

Description

Technical Field

[0001] This application relates to the field of automotive parts processing equipment, and in particular to a low-pressure die-casting device and method for steering knuckles. Background Technology

[0002] Vehicle steering knuckles are typically formed using low-pressure die casting, a metal casting process. Low-pressure die casting involves placing the mold above a sealed crucible, through which compressed air is introduced, creating pressure on the surface of the molten metal. This pressure causes the molten metal to rise through riser pipes to fill the mold and controls solidification. This casting method offers good feeding, resulting in dense castings. It is suitable for casting large, thin-walled, and complex parts, and boasts high metal yield. The process is now automated. Die-cast parts have smooth surfaces and high dimensional consistency.

[0003] In actual production, the crucible is in contact with molten metal for a long time, and impurities will exist in the molten metal. These impurities will slowly accumulate, so it is necessary to clean and remove the slag from the crucible regularly. However, when cleaning and removing the slag from the crucible, the holding furnace needs to be shut down, and the die-casting machine is in a stopped state, which seriously affects the processing efficiency. Summary of the Invention

[0004] To improve processing efficiency, this application provides a low-pressure die-casting device and method for steering knuckles.

[0005] On the one hand, the low-pressure die-casting device for steering knuckles provided in this application adopts the following technical solution:

[0006] A low-pressure die-casting device for steering knuckles includes a die-casting machine, a low-pressure air supply unit, and a holding furnace. A crucible is placed inside the holding furnace and connected to the die-casting machine via a riser pipe. An L-shaped placement box is connected below the holding furnace, with an opening at the top. The two ends of the placement box are located on opposite sides of the holding furnace. A bottom plate is hinged to the bottom of the holding furnace, and the crucible is placed on the bottom plate. A clamping mechanism is provided on the inner wall of the holding furnace for gripping and driving the crucible vertically in and out of the holding furnace. Placement plates are slidably arranged inside the placement box at both ends, with a crucible placed on one of the placement plates. A moving mechanism is also provided inside the placement box to drive the two placement plates to move linearly within the box. Cleaning components for cleaning the inner wall of the crucible are also provided at both ends of the placement box.

[0007] By adopting the above technical solution, during the production of the steering knuckle, molten metal is introduced into a crucible. The holding furnace is pressurized by a low-pressure air supply unit, and the molten metal is forced into the upper mold through a riser pipe. When it is necessary to clean the slag on the inner wall of the crucible, a moving mechanism drives an empty placement plate to move below the holding furnace, rotates the bottom plate downwards, and uses a clamping mechanism to lower the crucible onto the placement plate, driving the placement plate to reset. Then, the moving mechanism drives another placement plate containing an empty crucible to move below the holding furnace, and the clamping mechanism lifts the empty crucible into the holding furnace. At this time, the cleaning component cleans the crucible with slag. Through the rotation of the two crucibles, while the crucible is being cleaned and slag removed, the die-casting machine can operate normally using the other crucible, shortening the downtime of the die-casting machine and improving its efficiency.

[0008] Optionally, the heat preservation furnace is equipped with a rotating motor, and the output shaft of the rotating motor is fixedly connected to the rotating shaft of the base plate along the same axis.

[0009] By adopting the above technical solution, the rotating motor can easily drive the base plate to rotate.

[0010] Optionally, the clamping mechanism includes a first cylinder, a second cylinder, and a clamping plate. Two first cylinders are hinged to each other on the inner wall of the heat preservation furnace. The piston rods of the first cylinders extend downward. The clamping plate is located at the end of the piston rod of the first cylinder. Two second cylinders are also hinged to each other on the inner wall of the heat preservation furnace. The two second cylinders correspond to the two first cylinders, and the piston rods of the second cylinders extend upward at an angle and are hinged to the cylinder body of the first cylinder.

[0011] By adopting the above technical solution, the second cylinder drives the first cylinder to rotate. By the two first cylinders moving closer or further apart, the crucible is clamped or released. Then, the extension and retraction of the first cylinder drives the crucible to move in the vertical direction, thereby facilitating the movement of the crucible in and out of the holding furnace.

[0012] Optionally, the placement box is provided with a first slide rail and a second slide rail, which are parallel to two parts of the placement box respectively, and the two placement plates are slidably disposed on the first slide rail and the second slide rail respectively.

[0013] By adopting the above technical solution, the two placement plates are slidably installed on the first slide rail and the second slide rail respectively, which facilitates the movement of the placement plates in the placement box.

[0014] Optionally, the moving mechanism includes a first drive motor, a first bidirectional lead screw, a second drive motor, and a second bidirectional lead screw. The side wall of the placement box has a first slide groove parallel to the first slide rail and a second slide groove parallel to the second slide rail. The first bidirectional lead screw is rotatably mounted on the placement box and located within the first slide groove. The first drive motor is mounted on the placement box and coaxially connected to the first bidirectional lead screw. The second bidirectional lead screw is rotatably mounted on the placement box and located within the second slide groove. The second drive motor is mounted on the placement box and coaxially connected to the second bidirectional lead screw. The two placement plates are respectively threaded onto the first bidirectional lead screw and the second bidirectional lead screw.

[0015] By adopting the above technical solution, the first drive motor drives the first bidirectional lead screw to rotate, thereby driving one of the placement plates to move on the first slide rail; the second drive motor drives the second bidirectional lead screw to rotate, thereby driving the other placement plate to move along the second slide rail; thus achieving the effect of facilitating the movement of the placement plates.

[0016] Optionally, a plurality of fourth cylinders are arranged around the top of the placement plate, and the piston rods of the plurality of fourth cylinders all extend toward the center of the placement plate.

[0017] By adopting the above technical solution, multiple fourth cylinders are started simultaneously, which makes it easier to position and fix the crucible at the center of the upper surface of the placement plate.

[0018] Optionally, the piston rod of the fourth cylinder is provided with an arc-shaped positioning plate at its end.

[0019] By adopting the above technical solution, the arc-shaped positioning plate increases the contact area with the crucible, thereby making the crucible more securely fixed.

[0020] Optionally, the cleaning assembly includes a mounting plate, a third cylinder, a drive component, and a scraper. The mounting plate is provided at both ends of the placement box. The third cylinder is mounted on the mounting plate and its piston rod extends vertically downward. The scraper is mounted on the piston rod of the third cylinder. The drive component is mounted on the piston rod of the third cylinder and connected to the scraper. The drive component is used to drive the scraper to rotate.

[0021] By adopting the above technical solution, the third cylinder drives the scraper to move into the crucible, and then the drive component drives the scraper to rotate, so as to facilitate the scraper to clean the sediment on the inner wall of the crucible.

[0022] Optionally, the driving component includes a mounting box and a third drive motor. The mounting box is mounted on the piston rod of the third cylinder, the third drive motor is mounted inside the mounting box, and the output shaft of the third drive motor extends vertically downward through the mounting box. The scraper is connected to the output shaft of the third drive motor.

[0023] By adopting the above technical solution, the third drive motor can easily drive the scraper to rotate.

[0024] On the other hand, this application provides a low-pressure die-casting method for steering knuckles, comprising the following steps:

[0025] S1: Batching: Mix the various raw material metal ingots for the steering knuckle according to the design ratio; S2: Melt the proportioned raw materials in a melting furnace, and then pass the molten metal into a crucible in a holding furnace; S3: The low-pressure air supply unit pressurizes the inside of the die-casting machine, and the molten metal in the crucible is pumped into the mold cavity through the riser pipe for cooling and forming; S5: When there is a lot of slag in the crucible, the crucible is moved to the placement box by the grabbing mechanism, and the empty crucible is moved into the holding furnace by the moving mechanism and the grabbing mechanism; S6: The slag in the crucible is cleaned by the cleaning component; S7: The steering knuckle after casting is water-cooled and sawed and drilled to remove burrs; S8: Shot blasting is performed to improve the surface quality according to design requirements, and the steering knuckle is finely machined by a machine tool; S9: The qualified parts are packaged and stored in the warehouse.

[0026] By adopting the above technical solutions, while realizing the low-pressure die casting manufacturing of the turning joint, the downtime of the die casting machine can be minimized and production efficiency improved.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. During the production of the steering knuckle, molten metal is introduced into a crucible. The holding furnace is pressurized by a low-pressure air supply unit, and the molten metal is forced into the upper mold through a riser pipe. When slag needs to be cleaned from the inner wall of the crucible, a moving mechanism drives an empty placement plate to move below the holding furnace, rotates the bottom plate downwards, and uses a clamping mechanism to lower the crucible onto the placement plate, which is then reset. The moving mechanism then drives another placement plate containing an empty crucible to move below the holding furnace, and the clamping mechanism lifts the empty crucible into the holding furnace. At this point, the cleaning assembly cleans the crucible with slag. By alternating between the two crucibles, the die-casting machine can operate normally using the other crucible while the other crucible is being cleaned and removed, reducing downtime and improving efficiency.

[0029] 2. The first drive motor drives the first bidirectional lead screw to rotate, thereby driving one of the placement plates to move on the first slide rail; the second drive motor drives the second bidirectional lead screw to rotate, thereby driving the other placement plate to move along the second slide rail; thus achieving the effect of facilitating the movement of the placement plates.

[0030] 3. While achieving low-pressure die casting manufacturing of the turning joint, minimize the downtime of the die casting machine to improve production efficiency. Attached Figure Description

[0031] Figure 1 This is a structural schematic diagram of an embodiment of this application.

[0032] Figure 2 This is a schematic diagram illustrating the structure of the heat preservation furnace in the embodiments of this application.

[0033] Figure 3 This is a schematic diagram illustrating the placement box structure in the embodiments of this application.

[0034] Figure 4 This is a schematic diagram used to illustrate the structure of the cleaning component in the embodiments of this application.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Die-casting machine; 11. Lifting pipe; 2. Low-pressure air supply unit; 3. Holding furnace; 31. Crucible; 32. Base plate; 33. Rotary motor; 4. Placement box; 41. Placement plate; 411. Fourth cylinder; 412. Positioning plate; 42. First slide rail; 43. Second slide rail; 44. First slide groove; 45. Second slide groove; 51. First cylinder; 52. Second cylinder; 53. Clamping plate; 61. First drive motor; 62. First double-acting lead screw; 63. Second drive motor; 64. Second double-acting lead screw; 71. Mounting plate; 72. Third cylinder; 73. Drive component; 731. Mounting box; 732. Third drive motor; 75. Scraper. Detailed Implementation

[0037] The following detailed description of this application is provided in conjunction with attached Figure XX.

[0038] This application discloses a low-pressure die-casting device for steering knuckles, referring to... Figure 1 and Figure 2The low-pressure die-casting device for the steering knuckle includes a die-casting machine 1, a low-pressure air supply unit 2, and a holding furnace 3. The die-casting machine 1 is a common low-pressure die-casting machine on the market, located above the holding furnace 3. The low-pressure air supply unit 2 is located on one side of the holding furnace 3 and is connected to the holding furnace 3. Inside the die-casting machine 1 is a mold for receiving molten metal. Inside the holding furnace 3 is a crucible 31, which is connected to the die-casting machine 1 via a riser pipe 11. An L-shaped placement box 4 is installed below the holding furnace 3, with an opening at the top. The holding box 4 is located at a corner, with its two ends positioned on either side of the holding furnace 3. The bottom of the holding furnace 3 has an inlet / outlet for the crucible 31 to enter and exit. A base plate 32 is hinged to the bottom of the holding furnace 3, covering the inlet / outlet. The crucible 31 is located on the base plate 32. A clamping mechanism is installed on the inner wall of the holding furnace 3. This mechanism is used to clamp the crucible 31 and drive it vertically in and out of the holding furnace 3. Placement plates 41 are slidably installed inside the placement box 4 at both ends, with the crucible 31 placed on one of the plates 41. A moving mechanism is also installed inside the placement box 4, driving the two placement plates 41 to move linearly within the box, i.e., moving along two horizontal sections of the box 4. Cleaning components for cleaning the inner wall of the crucible 31 are also installed at both ends of the placement box 4.

[0039] Molten metal is fed into crucible 31 in holding furnace 3. Low-pressure air supply unit 2 pressurizes the holding furnace 3, forcing the molten metal in crucible 31 upwards through riser pipe 11 into die-casting machine 1. The molten metal cools and solidifies in the mold within die-casting machine 1. Since slag inevitably accumulates in crucible 31, a moving mechanism drives an empty placement plate 41 to move below the holding furnace 3, driving the base plate 32 to rotate away from the holding furnace 3. A clamping mechanism then clamps and lowers crucible 31 onto placement plate 41, driving placement plate 41 to reset. A cleaning assembly cleans the slag from the inner wall of crucible 31. Simultaneously, the moving mechanism drives placement plate 41, on top of crucible 31, to move below the holding furnace 3, and the clamping mechanism lifts the empty crucible 31 back into the holding furnace 3 for another die-casting operation. Thus, while cleaning crucible 31, another crucible 31 is moved into the holding furnace 3, shortening the downtime of the die-casting machine 1, and automatically cleaning crucible 31, thereby improving production efficiency.

[0040] Reference Figure 1 and Figure 2 A rotary motor 33 is installed on one side of the heat preservation furnace 3. The output shaft of the rotary motor 33 extends horizontally into the bottom wall of the heat preservation furnace 3 and is fixedly connected to the rotation shaft of the bottom plate 32 along the same axis. The rotary motor 33 facilitates the rotation of the bottom plate 32.

[0041] Reference Figure 1 and Figure 2 The clamping mechanism includes a first cylinder 51, a second cylinder 52, and a clamping plate 53. The first cylinder 51 is installed on the inner walls of opposite sides of the holding furnace 3. The cylinder body of the first cylinder 51 is hinged to the side wall of the holding furnace 3, and the piston rod of the first cylinder 51 extends downwards at an angle. The clamping plate 53 is hinged to the end of the piston rod of the first cylinder 51. The clamping plate 53 is an arc-shaped plate, and when the two clamping plates 53 are close together, they fit against the side wall of the crucible 31. Two second cylinders 52 are also installed on the inner wall of the holding furnace 3, corresponding one-to-one with the two first cylinders 51. The cylinder body of the second cylinder 52 is hinged to the side wall of the holding furnace 3 and located below the first cylinder 51. The piston rod of the second cylinder 52 extends upwards at an angle and is hinged to the cylinder body of the first cylinder 51.

[0042] Two second cylinders 52 are activated simultaneously, and their piston rods extend or retract, driving the two first cylinders 51 to rotate closer to or further apart from each other. When it is necessary to lower the crucible 31 into the placement box 4, the two first cylinders 51 clamp the crucible 31, and the first cylinders 51 and the second cylinders 52 are adjusted simultaneously to gradually lower the crucible 31 into the placement box 4 while clamping it. When the crucible 31 is removed from the placement box 4 and moved to the insulation box, the above operation is reversed.

[0043] Reference Figure 3 Inside the placement box 4, there are two slide rails 42 and two slide rails 43. The first slide rail 42 and the second slide rail 43 are parallel to the length direction of the two parts of the L-shaped placement box 4, respectively. There are gaps on the first slide rail 42 and the second slide rail 43 and at the intersection of the first slide rail 42 and the second slide rail 43. The bottom of the two placement plates 41 are equipped with sliders. The two placement plates 41 are slidably mounted on the first slide rail 42 and the second slide rail 43 respectively by the sliders.

[0044] Reference Figure 1 and Figure 3The moving mechanism includes a first drive motor 61, a first bidirectional lead screw 62, a second drive motor 63, and a second bidirectional lead screw 64. A first slide groove 44 parallel to the first slide rail 42 is formed on the side wall of the placement box 4 near the first slide rail 42, and a second slide groove 45 parallel to the second slide rail 43 is formed on the side wall of the placement box 4 near the second slide rail 43. Two placement plates 41 are slidably installed in the first slide rail 42 and the second slide groove 45, respectively. The first bidirectional lead screw 62 is rotatably installed on the placement box 4 and located in the first slide groove 44. The first drive motor 61 is installed on one side of the placement box 4, and the output shaft of the first drive motor 61 is coaxially connected to the first bidirectional lead screw 62. The second bidirectional lead screw 64 is rotatably installed on the placement box 4 and located in the second slide groove 45. The second drive motor 63 is installed on the placement box 4, and the output shaft of the second drive motor 63 extends into the second slide groove 45 and is coaxially connected to the second bidirectional lead screw 64. Two placement plates 41 are respectively threaded onto the first bidirectional lead screw 62 and the second bidirectional lead screw 64.

[0045] Start the first drive motor 61 or the second drive motor 63, which in turn drives the first bidirectional lead screw 62 or the second bidirectional lead screw 64 to rotate, thereby driving the placement plate 41 on the first slide rail 42 to move along the first slide rail 42 and the placement plate 41 on the second slide rail 43 to move along the second slide rail 43.

[0046] Reference Figure 3 The placement plate 41 is a rectangular plate, and multiple fourth cylinders 411 are mounted around its top. The piston rods of the fourth cylinders 411 all extend towards the center of the placement plate 41. Arc-shaped positioning plates 412 are fixedly mounted at the ends of the piston rods of the fourth cylinders 411, with the openings of the multiple arc-shaped positioning plates 412 facing each other. When the crucible 31 is placed on the placement plate 41, the multiple fourth cylinders 411 are simultaneously activated, and their piston rods extend to clamp the crucible 31 in a positioning position at the center of the top of the placement plate 41.

[0047] Reference Figure 1 and Figure 4 The cleaning assembly includes a mounting plate 71, a third cylinder 72, a drive unit 73, and a scraper 75. The mounting plate 71 is a C-shaped plate with its opening facing downwards. Both ends of the mounting plate 71 are connected to the side walls of the placement box 4. The cylinder body of the third cylinder 72 is fixedly mounted on the mounting plate 71, and the piston rod of the third cylinder 72 extends vertically downwards and passes through the mounting plate 71. The scraper 75 is mounted on the piston rod of the third cylinder 72 and is a T-shaped rod. The drive unit 73 is mounted on the piston rod of the third cylinder 72 and connected to the horizontal section of the scraper 75. The drive unit 73 is used to drive the scraper 75 to rotate.

[0048] Reference Figure 1 and Figure 4The drive unit 73 includes a mounting box 731 and a third drive motor 732. The mounting box 731 is a rectangular box and is fixedly installed at the end of the piston rod of the third cylinder 72. The third drive motor 732 is fixedly installed inside the mounting box 731, and the output shaft of the third drive motor 732 extends vertically downward through the mounting box 731. The scraper 75 is fixedly connected to the output shaft of the third drive motor 732.

[0049] When cleaning the crucible 31, the placement plate 41 on which the crucible 31 is placed is driven to move directly below the scraper 75. The third cylinder 72 is activated to move the scraper 75 into the crucible 31. At this time, the scraper 75 is in contact with the inner wall of the crucible 31. Then, the scraper 75 is driven to rotate by the third drive motor 732, thereby scraping off the sludge on the inner wall of the crucible 31.

[0050] The implementation principle of a low-pressure die-casting device for steering knuckles in this application embodiment is as follows: During long-term use, slag will accumulate on the side wall of the crucible 31. When there is a lot of slag in the crucible 31, the bottom plate 32 is driven to rotate downward, and the crucible 31 is clamped and lowered by the cooperation of the first cylinder 51 and the second cylinder 52. One of the placement plates 41 is driven to move to the bottom of the holding furnace 3. After the crucible 31 is placed on the placement plate 41, the placement plate 41 is driven to reset. At this time, another placement plate 41 with a clean crucible 31 is driven to move to the bottom of the holding furnace 3, and the clean crucible 31 is moved into the holding furnace 3 to continue working. At the same time, the cleaning component cleans the crucible 31 with slag.

[0051] This application also discloses a low-pressure die-casting method for steering knuckles, including the following steps:

[0052] S1: Ingredients: Mix the main raw material aluminum-silicon alloy and the auxiliary materials magnesium, aluminum-strontium alloy and aluminum-titanium-boron alloy in a ratio of 1600:1:1:1.

[0053] S2: Place the proportioned raw materials into the melting furnace, melt at 750℃ for 1 hour, and then pass the molten metal into crucible 31 in the holding furnace 3.

[0054] S3: Core making, coated sand and resin are injected into the hot core box mold at a ratio of 99:1 to form a sand core. The core making temperature is 260±15℃. The sand core is placed in the die casting machine 1 and connected to the riser pipe 11.

[0055] S4: Pressurize the inside of the die-casting machine 1 through the low-pressure air supply unit 2, and send the molten metal in the crucible 31 into the mold cavity through the riser pipe 11. Filter the molten metal with a filter screen to ensure that a flat and good product blank is obtained.

[0056] S5: The molten metal fills the mold under the action of gravity, and the casting temperature is 730±15℃.

[0057] S6: After a large amount of slag accumulates in crucible 31, a new crucible 31 is replaced by using the cooperation of the clamping mechanism and the moving mechanism to continue die casting.

[0058] S7: The sludge inside the replaced crucible 31 is cleaned by the cleaning component, and the sludge is removed from the crucible 31.

[0059] S8: Take out the cooled and formed steering knuckle blank and put it into a water tank for water cooling. After water cooling for 3 minutes, take out the blank.

[0060] S9: Use a circular saw to remove the sprues and burrs around the blank, and use a drilling machine to drill holes at the locations where drilling is required;

[0061] S10: Non-destructive testing of the workpiece is performed using an X-ray flaw detector to detect internal defects such as porosity and shrinkage. Then, fluorescent liquid is applied to the surface of the casting, followed by the application of display powder. Under the illumination of a fluorescent lamp, the surface of the casting is then inspected for flaws.

[0062] S11: Castings that pass internal and surface flaw detection are sent to the heat treatment area for solution treatment and failure treatment. The castings are kept at a constant temperature for 40 minutes in a chain heat treatment furnace, then cooled in a quenching pool, then heated in a pit heat treatment furnace, and finally air cooled in a cooling chamber.

[0063] S12: Cold treatment removes oxide scale and other impurities from the surface of castings to improve appearance quality. High-speed projectiles (60-110m / s) continuously impact the surface of the workpiece to be strengthened, improving the fatigue fracture resistance of the parts and preventing fatigue failure.

[0064] S13: To achieve precision machining of products using machine tools and cutting tools in order to meet the accuracy requirements of product dimensions;

[0065] S14: Pack qualified castings and store them in the warehouse.

[0066] Finally, it should be noted that in the description of this application, the terms "vertical," "upper," "lower," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0067] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A low-pressure die-casting device for steering knuckles, comprising a die-casting machine (1), a low-pressure air supply unit (2), and a holding furnace (3), wherein a crucible (31) is provided inside the holding furnace (3), and the crucible (31) is connected to the die-casting machine (1) via a riser pipe (11), characterized in that: A placement box (4) is connected below the heat preservation furnace (3). The placement box (4) has an opening at the top and its two ends are located on both sides of the heat preservation furnace (3). A bottom plate (32) is hinged to the bottom of the heat preservation furnace (3). The crucible (31) is located on the bottom plate (32). A clamping mechanism is provided on the inner wall of the heat preservation furnace (3) for clamping and driving the crucible (31) to move vertically in and out of the heat preservation furnace (3). Placement plates (41) are slidably arranged inside the placement box (4) and at both ends of the placement box (4). One of the placement plates (41) holds the crucible (31). A moving mechanism is also provided inside the placement box (4) for driving the two placement plates (41) to move linearly inside the placement box (4). Both ends of the placement box (4) are also provided with useful... A cleaning assembly for cleaning the inner wall of the crucible (31); a rotating motor (33) is provided on the heat preservation furnace (3), and the output shaft of the rotating motor (33) is fixedly connected to the rotating shaft of the base plate (32) on the same axis; the clamping mechanism includes a first cylinder (51), a second cylinder (52) and a clamping plate (53), two first cylinders (51) are hinged to each other on the inner wall of the heat preservation furnace (3), the piston rod of the first cylinder (51) extends downward, the clamping plate (53) is located at the end of the piston rod of the first cylinder (51), two second cylinders (52) are also hinged to the inner wall of the heat preservation furnace (3), the two second cylinders (52) correspond to the two first cylinders (51), and the piston rod of the second cylinder (52) extends upward at an angle and is hinged to the cylinder body of the first cylinder (51).

2. The low-pressure die-casting device for steering knuckles according to claim 1, characterized in that: The placement box (4) is provided with a first slide rail (42) and a second slide rail (43). The first slide rail (42) and the second slide rail (43) are parallel to two parts of the placement box (4) respectively. The two placement plates (41) are slidably disposed on the first slide rail (42) and the second slide rail (43) respectively.

3. The low-pressure die-casting device for steering knuckles according to claim 2, characterized in that: The moving mechanism includes a first drive motor (61), a first bidirectional lead screw (62), a second drive motor (63), and a second bidirectional lead screw (64). The side wall of the placement box (4) is provided with a first slide groove (44) parallel to the first slide rail (42) and a second slide groove (45) parallel to the second slide rail (43). The first bidirectional lead screw (62) is rotatably mounted on the placement box (4) and located in the first slide groove (44). The first drive motor (61) is set on the placement box (4) and coaxially connected to the first bidirectional lead screw (62). The second bidirectional lead screw (64) is rotatably mounted on the placement box (4) and located in the second slide groove (45). The second drive motor (63) is set on the placement box (4) and coaxially connected to the second bidirectional lead screw (64). The two placement plates (41) are respectively threaded onto the first bidirectional lead screw (62) and the second bidirectional lead screw (64).

4. The low-pressure die-casting device for steering knuckles according to claim 1, characterized in that: The top of the placement plate (41) is provided with a plurality of fourth cylinders (411), and the piston rods of the plurality of fourth cylinders (411) extend toward the center of the placement plate (41).

5. The low-pressure die-casting device for steering knuckles according to claim 4, characterized in that: The piston rod of the fourth cylinder (411) is provided with an arc-shaped positioning plate (412) at the end.

6. The low-pressure die-casting device for steering knuckles according to claim 5, characterized in that: The cleaning assembly includes a mounting plate (71), a third cylinder (72), a drive unit (73), and a scraper (75). The mounting plate (71) is provided at both ends of the placement box (4). The third cylinder (72) is mounted on the mounting plate (71) and the piston rod of the third cylinder (72) extends vertically downward. The scraper (75) is mounted on the piston rod of the third cylinder (72). The drive unit (73) is mounted on the piston rod of the third cylinder (72) and connected to the scraper (75). The drive unit (73) is used to drive the scraper (75) to rotate.

7. The low-pressure die-casting device for steering knuckles according to claim 6, characterized in that: The drive unit (73) includes a mounting box (731) and a third drive motor (732). The mounting box (731) is mounted on the piston rod of the third cylinder (72). The third drive motor (732) is mounted inside the mounting box (731), and the output shaft of the third drive motor (732) extends vertically downward through the mounting box (731). The scraper (75) is connected to the output shaft of the third drive motor (732).

8. A method for low-pressure die casting of a steering knuckle based on the low-pressure die casting device of any one of claims 1-7, characterized in that, Includes the following steps: S1: Batching, which involves mixing the various raw material metal ingots for the steering knuckle according to the designed proportions; S2: The proportioned raw materials are melted in a melting furnace, and the molten metal is fed into the crucible (31) in the holding furnace (3); S3: The low-pressure air supply unit (2) pressurizes the inside of the die-casting machine (1) and sends the molten metal in the crucible (31) through the riser pipe (11) to the mold cavity for cooling and forming; S4: When there is a lot of sludge in the crucible (31), the crucible (31) is moved to the placement box (4) by using the clamping mechanism, and the empty crucible (31) is moved to the heat preservation furnace (3) by the cooperation of the moving mechanism and the clamping mechanism. S5: Clean the sludge in the crucible (31) using the cleaning component; S6: After casting, the steering knuckle is water-cooled and then sawed and drilled to remove burrs. S7: Shot blasting is performed to improve surface quality according to design requirements, and the steering knuckle is then precision machined using machine tools; S8: Pack qualified parts into warehouse for storage.

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