A vacuum melting and casting method

Abstract

The present application relates to the technical field of vacuum melting and casting, and in particular to a vacuum melting and casting fixed-point pouring method. After smelting is completed by a smelting furnace in a smelting chamber, a mold shell is moved to a holding chamber for positioning, so that a pouring cup of the mold shell is arranged into a pouring hole at the top of the holding chamber. A push rod is controlled to push the smelting furnace to rotate around a first axis by a first rotation direction by a first angle, so that the smelting furnace is rotated from a vertical state to a first inclined state. A lifting rod is controlled to lower the first axis by a preset distance, so that the smelting furnace is rotated around the first axis by the first rotation direction by a second angle, and the smelting furnace is rotated from the first inclined state to a second inclined state. The push rod is controlled to rotate the smelting furnace around the first axis by the first rotation direction by a third angle, so that the smelting furnace is rotated from the second inclined state to a third inclined state. The present application can solve the problem of excessive height difference caused by a vacuum condition, and can ensure the falling point accuracy of the metal liquid pouring and casting process in the smelting furnace.

Description

Technical Field

[0001] This invention relates to the field of vacuum casting technology, and more specifically, to a vacuum casting method for point pouring. Background Technology

[0002] Vacuum casting equipment is a core piece of equipment in the field of precision metal forming, and each of its working chambers must complete its corresponding process in a stable vacuum environment. In the structural design of existing vacuum casting equipment, the melting chamber for melting metal raw materials and the insulation chamber for heat preservation of the mold shell are usually set up as independent separate structures. This structure ensures that when the vacuum environment in the melting chamber is broken due to operations such as adding material, it will not interfere with the stable vacuum level maintained in the insulation chamber, thus ensuring the continuity and stability of the heat preservation process. In terms of spatial layout, existing technologies generally place the melting chamber above the insulation chamber. This layout ensures that the entire structure of the melting furnace in the melting chamber is positioned above the pouring cup of the mold shell in the insulation chamber, thereby meeting the requirement that the molten metal be poured and cast by gravity after melting.

[0003] However, due to the structural limitations of the existing vertical layout of the melting chamber and the insulation chamber, there is a significant height difference between the furnace nozzle and the pouring cup of the mold shell. During the pouring of molten metal from the furnace nozzle, the molten metal will be affected by factors such as slight deviations in the pouring action and airflow disturbances in the vacuum environment during its long descent. This causes the trajectory of the molten metal to deviate, ultimately directly affecting the accuracy of the molten metal's entry point into the pouring cup. The core problem is the excessive height difference caused by the existing structure, which cannot guarantee the accuracy of the molten metal's entry point during the pouring process. Summary of the Invention

[0004] To address the problem of excessive height difference under vacuum conditions, which makes it difficult to ensure the accuracy of the pouring point during the molten metal casting process in the melting furnace, this invention provides a vacuum melting and casting method for precise point pouring, comprising:

[0005] Once the melting process in the melting furnace within the melting chamber is complete, the mold shell is moved to the holding chamber for positioning, so that the pouring cup of the mold shell passes through the pouring hole at the top of the holding chamber; the pouring hole is vertically oriented; the melting chamber is located above the holding chamber; the melting furnace is located on one side of the space above the pouring hole, offset along a first horizontal direction.

[0006] A control push rod pushes the smelting furnace to rotate around a first axis in a first direction by a first angle, so that the smelting furnace rotates from a vertical state to a first tilted state; wherein, the first axis is horizontally arranged; the first angle is an acute angle; the first axis is located on the side of the space above the pouring hole that is offset from the first horizontal direction;

[0007] The control lifting rod lowers the first axis by a preset distance, so that the smelting furnace rotates around the first axis in the first direction by a second angle, and the smelting furnace rotates from the first tilted state to the second tilted state; during the descent of the first axis, the push rod swings with the smelting furnace;

[0008] The push rod is controlled to rotate the smelting furnace around the first axis in the first direction by a third angle, so that the smelting furnace is rotated from the second tilt state to the third tilt state.

[0009] Optionally, the second angle is greater than the first angle.

[0010] Optionally, the third angle is greater than the second angle.

[0011] Optionally, the sum of the first angle, the second angle, and the third angle is greater than 90°.

[0012] Optionally, the vacuum casting point pouring method further includes:

[0013] When the smelting furnace is in the second tilted state and the smelting furnace rotates toward the third tilted state, the smelting furnace is controlled to move along the first horizontal direction until the smelting furnace reaches the first preset condition.

[0014] Optionally, the first preset condition includes that the smelting furnace is horizontally positioned.

[0015] Optionally, the vacuum casting point pouring method further includes:

[0016] When the smelting furnace reaches the first preset condition and the smelting furnace rotates toward the third tilt state, the smelting furnace is controlled to move along the second horizontal direction until the smelting furnace reaches the second preset condition; the first horizontal direction is opposite to the second horizontal direction.

[0017] Optionally, the second preset condition includes the smelting furnace being in the third tilted state.

[0018] Optionally, the second distance is greater than the first distance; the first distance is the distance the smelting furnace moves along the first horizontal direction; the second distance is the distance the smelting furnace moves along the second horizontal direction.

[0019] Optionally, the vacuum casting point pouring method further includes:

[0020] Once the furnace charge has been poured out, the smelting furnace is restored to its vertical, upward-facing position.

[0021] Optionally, the step of restoring the smelting furnace to a vertically upward position after the furnace charge has been poured out includes:

[0022] Once the furnace charge has been poured, the push rod is controlled to rotate the smelting furnace around the first axis in a second direction at the third angle, while simultaneously controlling the smelting furnace to move a third distance along the first horizontal direction, so that the smelting furnace is adjusted from the third tilt state to the second tilt state; wherein, the third distance is the difference between the second distance and the first distance;

[0023] The lifting rod is controlled to raise the first axis by the preset distance, so that the smelting furnace rotates around the first axis in the second direction at the second angle, and the smelting furnace is adjusted from the second tilt state to the first tilt state;

[0024] The push rod is controlled to rotate the smelting furnace about the first axis in the second direction by the first angle, so that the smelting furnace is restored from the first tilted state to the vertical state.

[0025] Optionally, when the smelting furnace is in the completed state, the amount of molten metal contained in the smelting furnace is less than 80% of the volume of the smelting furnace, so that the amount of molten metal flowing out of the smelting furnace during the process of the smelting furnace changing from a vertical state to the second inclined state is 0.

[0026] To address the problem of excessive height difference under vacuum conditions, which makes it difficult to ensure the accuracy of the pouring point during the molten metal casting process in the melting furnace, this invention has the following advantages:

[0027] By controlling the push rod, the smelting furnace is rotated around a horizontally set first axis in a first direction by a first angle, changing the furnace from a vertical to a first tilted state. Then, the lifting rod is controlled to lower the first axis by a preset distance, causing the furnace to rotate around the first axis in a first direction by a second angle and from the first tilted state to a second tilted state, simultaneously reducing the overall height of the furnace during the tilting process. Finally, the push rod is controlled to rotate the furnace around the first axis in a first direction by a third angle, changing the furnace from the second tilted state to a third tilted state, completing the precise pouring of the molten metal. This reduces the height difference between the furnace nozzle and the pouring cup of the mold shell, simplifies the control of the molten metal's landing point during pouring, and ultimately solves the problems of a high height difference between the furnace nozzle and the pouring cup and insufficient accuracy in the molten metal's landing point during pouring. Attached Figure Description

[0028] Figure 1 A flowchart of the vacuum casting point pouring method is shown;

[0029] Figure 2 A schematic diagram of a vacuum casting point pouring device is shown;

[0030] Figure 3 A front view of the vacuum casting point pouring apparatus is shown;

[0031] Figure 4 A schematic diagram of the first tilted state of the vacuum casting point pouring device is shown;

[0032] Figure 5 A schematic diagram of the second tilted state of the vacuum casting point pouring device is shown;

[0033] Figure 6 A schematic diagram of the third tilt state of the vacuum casting point pouring device is shown.

[0034] Reference numerals: smelting furnace 10; push rod 20; lifting rod 30; first axis 40; first angle α1; second angle α2; third angle α3. Detailed Implementation

[0035] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, and are not intended to imply any limitation on the scope of the disclosure.

[0036] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments and are not intended to limit the indicated devices, elements, or components to having a specific orientation or being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientations or positional relationships; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances. In addition, the terms "installed", "set up", "equipped with", "connected", and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, the terms "first," "second," etc., are mainly used to distinguish different devices, elements, or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0037] In this embodiment, a vacuum casting method for point pouring is provided, such as... Figure 1 As shown, the vacuum casting fixed-point pouring method includes steps S10 to S40, and the vacuum casting fixed-point pouring method executes steps S10, S20, S30 and S40 in sequence.

[0038] In step S10, based on the completion of melting in the melting furnace 10 within the melting chamber, the mold shell is moved to the holding chamber for positioning, so that the pouring cup of the mold shell passes through the pouring hole at the top of the holding chamber. The pouring hole is vertically positioned to ensure that the molten metal can be accurately poured into the pouring hole, avoiding pouring deviation. The melting chamber is located above the holding chamber, and the melting furnace 10 is located on one side of the space above the pouring hole, offset along the first horizontal direction, thus providing sufficient space for the rotation and tilting of the melting furnace 10.

[0039] In step S20, the control push rod 20 pushes the smelting furnace 10 to rotate around the first axis 40 by a first rotational direction and a first angle α1, so that the smelting furnace 10 rotates from a vertical state to a first tilted state, realizing the initial adjustment of the tilting angle of the smelting furnace 10, and making the smelting furnace 10 move closer to the pouring hole for the first time. The first tilted state is as follows: Figure 4 As shown, the first axis 40 is horizontally positioned. The first angle α1 is an acute angle, thereby preventing premature overflow of the molten metal in the melting furnace 10 during the initial adjustment stage and ensuring the safety and controllability of the pouring process. The first axis 40 is located on one side of the space above the pouring hole, offset along the first horizontal direction.

[0040] In step S30, the lifting rod 30 is controlled to lower the first axis 40 by a preset distance, so that the smelting furnace 10 rotates around the first axis 40 in a first direction by a second angle α2, and the smelting furnace 10 rotates from a first tilted state to a second tilted state. The second tilted state is as follows: Figure 5 The state shown should be understood as follows: the second rotation of the smelting furnace 10 brings it closer to the pouring cup, while simultaneously lowering the height of the opening end of the smelting furnace 10, thereby reducing the difficulty of controlling the drop point of the molten metal. During the descent of the first axis 40, the push rod 20 swings with the smelting furnace 10.

[0041] In step S40, the push rod 20 is controlled to rotate the smelting furnace 10 around the first axis 40 by a third angle α3 in the first direction, so that the smelting furnace 10 rotates from the second tilting state to the third tilting state. The third tilting state is as follows: Figure 6 The state shown is as follows. The melting furnace 10 is rotated a third time by push rod 20, achieving the final adjustment of the tilting angle of the melting furnace 10. This application uses three-step rotations to gradually bring the melting furnace 10 closer to the pouring cup, thereby improving the control precision of molten metal pouring and achieving a precise, fixed-point pouring effect.

[0042] In other embodiments, such as Figure 2 , Figure 3 As shown, the vacuum casting point pouring method is applied to a vacuum casting point pouring device. The vacuum casting point pouring device includes a melting furnace 10, a lifting rod 30, a push rod 20, and a support. One end of the lifting rod 30 is rotatably connected to the melting furnace 10 about a first axis 40, and the other end is fixedly connected to the support. One end of the push rod 20 is rotatably connected to the support, and the other end is rotatably connected to the melting furnace 10.

[0043] Furthermore, such as Figure 4 , Figure 5As shown, the second angle α2 is greater than the first angle α1. This should be understood as follows: by adopting a step-by-step angle adjustment method, starting with a smaller initial angle α1, leakage and spillage of the molten metal in the melting furnace 10 during the initial pouring adjustment can be avoided, ensuring stability in the initial pouring stage. Subsequently, a larger second angle α2 is achieved through a greater descent distance of the first axis 40, which can accelerate the pouring progress of the melting furnace 10, improve the pouring efficiency of the molten metal, and, in conjunction with the descent of the first axis 40, significantly reduce the height of the opening end of the melting furnace 10. This reduces the initial height difference between the furnace nozzle and the pouring cup during the oscillation of the molten metal from the second to the third tilt state, thereby improving the control precision of the pouring point when oscillating from the second to the third tilt state, ensuring that the entire pouring process is stable, controllable, efficient, and smooth.

[0044] Furthermore, such as Figure 5 , Figure 6 As shown, the third angle α3 is greater than the second angle α2. This should be understood as follows: by setting the third angle α3 to be greater than the second angle α2, i.e., a progressive design with gradually increasing tilting angles, the initially smaller first angle α1 and second angle α2 ensure a stable flow of molten metal during the initial tilting of the furnace 10, guaranteeing the stability of the pouring process. The subsequent larger third angle α3 allows the furnace nozzle of the furnace 10 to approach the pouring cup more closely, achieving the final tilting posture with the height difference between the nozzle and the pouring cup at its minimum, compensating for the limitation of the lifting distance of the first axis 40. Simultaneously, the greater angle difference between the final tilting posture and the vertically upward posture of the furnace 10 opening increases the outflow velocity of the molten metal, ensuring complete discharge of the molten metal within the furnace 10 and preventing molten metal residue within the furnace 10.

[0045] Furthermore, the sum of the first angle α1, the second angle α2, and the third angle α3 is greater than 90°, so that after the smelting furnace 10 rotates in three steps, the final tilt angle exceeds 90°, so that the opening end of the smelting furnace 10 faces downwards. This ensures that the molten metal in the smelting furnace 10 can be completely poured out under the action of gravity, avoiding the problem of molten metal residue in the furnace and reducing the waste of raw materials.

[0046] Furthermore, the vacuum casting fixed-point pouring method also includes step S50, in which steps S10, S20, S30, S40 and S50 are executed sequentially.

[0047] In step S50, when the smelting furnace 10 is in the second tilted state and is rotating towards the third tilted state, the smelting furnace 10 is controlled to move along the first horizontal direction until the smelting furnace 10 reaches the first preset condition. During the movement of the smelting furnace 10 along the first horizontal direction, the horizontal position of the furnace nozzle can be adjusted in real time, thereby adjusting the landing point of the poured molten metal. This ensures that the landing point of the poured molten metal from the furnace nozzle is always aligned with the pouring cup, minimizing horizontal deviation between the landing point and the pouring cup due to changes in the tilting angle. Therefore, this application ensures that the poured molten metal from the smelting furnace 10 accurately falls into the pouring cup, achieving precise point-to-point pouring, avoiding spillage and waste, and improving the accuracy and pass rate of the pouring operation. The first condition can be the orientation of the smelting furnace 10, a preset working time, or the remaining weight of the molten metal inside the smelting furnace 10, etc.

[0048] Furthermore, in one embodiment, the first preset condition includes the smelting furnace 10 being horizontally positioned, providing a clear and precisely identifiable termination reference for the rotation and horizontal movement of the smelting furnace 10. This allows the equipment to precisely control the stopping point of the adjustment action, avoiding problems of over- or under-adjustment. When the smelting furnace 10 is horizontally positioned, the furnace nozzle of the smelting furnace 10 can be stably maintained directly above the pouring cup, and the outflow path of the molten metal inside the furnace precisely corresponds to the central axis of the pouring cup, further ensuring that the molten metal can accurately fall into the pouring cup, avoiding problems of pouring deviation and molten metal spillage.

[0049] Furthermore, the vacuum casting fixed-point pouring method also includes step S60, in which steps S10, S20, S30, S40, S50 and S60 are executed sequentially.

[0050] Step S60: When the smelting furnace 10 reaches the first preset condition and rotates towards the third tilt state, control the smelting furnace 10 to move along the second horizontal direction until the smelting furnace 10 reaches the second preset condition. Real-time compensation is performed to address the reverse horizontal position offset caused by a further increase in the tilting angle of the smelting furnace 10, ensuring that the landing point of the molten metal poured from the furnace nozzle is precisely aligned with the top of the pouring cup throughout the entire pouring process. This avoids positional offset between the landing point of the molten metal poured from the furnace nozzle and the pouring cup due to the continuous increase in the rotation angle of the smelting furnace 10. Therefore, this application can ensure that the molten metal accurately falls into the pouring cup throughout the entire pouring process, minimizing the problems of molten metal spillage and pouring deviation. The first horizontal direction is opposite to the second horizontal direction. The second preset condition serves as the termination node for the horizontal movement of the smelting furnace 10, providing a clear action stop reference for the rotation of the smelting furnace 10. The second preset condition can be the posture of the smelting furnace 10, the preset working time, or the remaining weight of the molten metal inside the smelting furnace 10, etc.

[0051] Furthermore, in one embodiment, the second preset condition includes the smelting furnace 10 being in a third tilted state, thereby providing a clear and accurately identifiable termination reference for the movement of the smelting furnace 10 along the second horizontal direction. This enables the equipment to precisely control the stopping point of the horizontal adjustment action, avoiding problems of excessive or insufficient horizontal movement, and ensuring the consistency and control precision of each pouring operation. By simultaneously completing the reverse horizontal movement throughout the entire process of the smelting furnace 10 rotating from the first preset condition to the third tilted state, until the adjustment stops when the smelting furnace 10 reaches the third tilted state, it can be ensured that the furnace nozzle is always precisely aligned with the top of the pouring cup throughout the entire process of the smelting furnace 10 continuously increasing the tilting angle to the final posture. This avoids positional deviation between the molten metal landing point and the pouring cup due to changes in the tilting angle, thereby ensuring that the molten metal accurately falls into the pouring cup throughout the entire pouring process, avoiding problems of molten metal spillage and pouring deviation. Meanwhile, the third tilt state is the final tilting posture of the smelting furnace 10 after three steps of rotation. This serves as the termination condition for the horizontal position adjustment action of the smelting furnace 10, ensuring that the smelting furnace 10 reaches the preset final tilting angle. Under the premise of ensuring casting accuracy, the molten metal in the smelting furnace 10 can be completely discharged under the action of gravity, reducing the molten metal residue in the furnace and improving the utilization rate of raw materials and the overall efficiency of the casting operation.

[0052] Furthermore, the second distance is greater than the first distance. The first distance is the distance the smelting furnace 10 moves along the first horizontal direction. The second distance is the distance the smelting furnace 10 moves along the second horizontal direction. It should be understood that in the initial stage of the smelting furnace 10 rotating from the second tilted state to the third tilted state, the molten metal will gain forward inertia with the tilting action of the smelting furnace 10, and its parabolic trajectory will be relatively far. By moving the smelting furnace 10 along the first horizontal direction by the first distance, the trajectory deviation in this stage can be compensated, ensuring that the molten metal in the initial tilting stage falls accurately into the pouring cup. As the tilting angle of the smelting furnace 10 continues to increase, the outflow state of the molten metal gradually stabilizes, and its parabolic trajectory gradually shrinks. The tilting time during the trajectory shrinkage is greater than the tilting time during the initial trajectory expansion. By setting a larger second distance, the amount of molten metal trajectory shrinkage can be fully compensated, ensuring that the position of the furnace nozzle of the smelting furnace 10 is always precisely matched with the falling trajectory of the molten metal and the position of the pouring cup throughout the entire tilting process. This fully ensures that the landing point of the molten metal is always accurately aligned with the pouring cup during the overall pouring process, avoiding problems such as molten metal spillage and pouring deviation, and improving the pass rate and operational stability of fixed-point pouring.

[0053] Furthermore, the vacuum casting fixed-point pouring method also includes step S70, in which steps S10, S20, S30, S40, S50, S60 and S70 are executed sequentially.

[0054] Step S70: After the furnace charge is poured out, the melting furnace 10 is restored to a vertically upward position, so that the melting furnace 10 is reset to its initial working state after completing this casting operation. This facilitates the subsequent reloading of furnace charge to carry out a new round of melting operations, preparing for the casting of the next shell component, realizing the continuous cycle of vacuum melting and casting operations, and improving overall production efficiency.

[0055] The vacuum casting fixed-point pouring method also includes step S70, which is performed sequentially as follows: step S10, step S20, step S30, step S40, step S50, step S60, step S71, step S72, and step S73.

[0056] In step S71, after the furnace charge is tilted, the control pusher 20 rotates the smelting furnace 10 around the first axis 40 by a third angle α3 in the second direction. Simultaneously, the control pusher moves the smelting furnace 10 a third distance along the first horizontal direction, adjusting the smelting furnace 10 from the third tilted state to the second tilted state. This ensures precise and controllable position and attitude of the smelting furnace 10 during the reset process, preventing interference between the reset action and surrounding structures such as the insulation chamber and pouring holes. Using a step-by-step reset method that corresponds to the reverse of the tilting stage prevents residual furnace charge from dripping or spilling due to rapid changes in the furnace's attitude, ensuring cleanliness and operational safety within the vacuum chamber. The third distance is the difference between the second and first distances.

[0057] In step S72, the lifting rod 30 is controlled to raise the first axis 40 by a preset distance, so that the smelting furnace 10 rotates around the first axis 40 in a second direction by a second angle α2, adjusting the smelting furnace 10 from the second tilted state to the first tilted state. This restores the initial posture of the second step of the tilting stage. The upward movement of the lifting rod 30 is synchronized with the reverse rotation of the smelting furnace 10, ensuring the stability of the smelting furnace 10's posture during the reset process and avoiding problems such as shaking or positional deviation.

[0058] In step S73, the push rod 20 is controlled to rotate the smelting furnace 10 around the first axis 40 by a first angle α1 in the second direction, so that the smelting furnace 10 is restored from the first tilted state to the vertical state, accurately restoring the initial posture of the smelting operation. The three-step reset method, which is completely opposite to the tilting stage, can ensure that the entire reset process is smooth and the posture and position control is precise. It fully matches the action logic of the tilting stage, providing a unified and stable initial state for the next round of smelting and casting operations, realizing the continuous cycle of vacuum casting and fixed-point casting operations, and improving the overall production efficiency and operation consistency.

[0059] Furthermore, when the melting process in the furnace 10 is complete, the molten metal inside the furnace 10 is less than 80% of its volume. This ensures that the amount of molten metal flowing out of the furnace 10 during the transition from a vertical to a second tilted position is zero. This should be understood as reserving sufficient safe space for the molten metal to prevent the molten metal level from becoming too high. Simultaneously, during the transition from a vertical to a second tilted position, a step-by-step, acute-angle adjustment is used. The tilting angle gradually increases but remains relatively low overall. This ensures that the molten metal level remains below the edge of the furnace opening during this process, achieving the effect of zero molten metal flowing out of the furnace 10 at this stage. This avoids premature leakage or spillage of molten metal during the pouring preparation stage, ensuring the safety and stability of the pouring process and providing a reliable prerequisite for subsequent precise, targeted pouring.

[0060] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes can be made in form and detail without departing from the scope of this disclosure.

Claims

1. A vacuum casting method for fixed-point pouring, characterized in that, The vacuum casting point pouring method includes: Once the melting process in the melting furnace within the melting chamber is complete, the mold shell is moved to the holding chamber for positioning, so that the pouring cup of the mold shell passes through the pouring hole at the top of the holding chamber; the pouring hole is vertically oriented; the melting chamber is located above the holding chamber; the melting furnace is located on one side of the space above the pouring hole, offset along a first horizontal direction. A control push rod pushes the smelting furnace to rotate around a first axis in a first direction by a first angle, so that the smelting furnace rotates from a vertical state to a first tilted state; wherein, the first axis is horizontally arranged; the first angle is an acute angle; the first axis is located on the side of the space above the pouring hole that is offset from the first horizontal direction; The control lifting rod lowers the first axis by a preset distance, so that the smelting furnace rotates around the first axis in the first direction by a second angle, and the smelting furnace rotates from the first tilted state to the second tilted state; during the descent of the first axis, the push rod swings with the smelting furnace; The push rod is controlled to rotate the smelting furnace around the first axis in the first direction by a third angle, so that the smelting furnace is rotated from the second tilt state to the third tilt state.

2. The vacuum casting method for fixed-point pouring according to claim 1, characterized in that, The second angle is greater than the first angle.

3. The vacuum casting method for fixed-point pouring according to claim 1, characterized in that, The third angle is greater than the second angle.

4. The vacuum casting method for fixed-point pouring according to claim 1, characterized in that, The sum of the first angle, the second angle, and the third angle is greater than 90°.

5. The vacuum casting method for fixed-point pouring according to claim 1, characterized in that, The vacuum casting point pouring method also includes: When the smelting furnace is in the second tilted state and the smelting furnace rotates toward the third tilted state, the smelting furnace is controlled to move along the first horizontal direction until the smelting furnace reaches the first preset condition.

6. The vacuum casting method for fixed-point pouring according to claim 5, characterized in that, The first preset condition includes that the smelting furnace is horizontally positioned.

7. The vacuum casting method for fixed-point pouring according to claim 5, characterized in that, The vacuum casting point pouring method also includes: When the smelting furnace reaches the first preset condition and the smelting furnace rotates toward the third tilt state, the smelting furnace is controlled to move along the second horizontal direction until the smelting furnace reaches the second preset condition; the first horizontal direction is opposite to the second horizontal direction.

8. The vacuum casting method for fixed-point pouring according to claim 7, characterized in that, The second preset condition includes the smelting furnace being in the third tilted state.

9. A vacuum casting method for fixed-point pouring according to claim 7, characterized in that, The second distance is greater than the first distance; the first distance is the distance the smelting furnace moves along the first horizontal direction; the second distance is the distance the smelting furnace moves along the second horizontal direction.

10. A vacuum casting method for fixed-point pouring according to claim 9, characterized in that, The vacuum casting point pouring method also includes: Once the furnace charge has been poured out, the smelting furnace is restored to its vertical, upward-facing position.

11. A vacuum casting method for fixed-point pouring according to claim 10, characterized in that, The step of restoring the smelting furnace to a vertically upward position after the furnace charge has been poured out includes: Once the furnace charge has been poured, the push rod is controlled to rotate the smelting furnace around the first axis in a second direction at the third angle, while simultaneously controlling the smelting furnace to move a third distance along the first horizontal direction, so that the smelting furnace is adjusted from the third tilt state to the second tilt state; wherein, the third distance is the difference between the second distance and the first distance; The lifting rod is controlled to raise the first axis by the preset distance, so that the smelting furnace rotates around the first axis in the second direction at the second angle, and the smelting furnace is adjusted from the second tilt state to the first tilt state; The push rod is controlled to rotate the smelting furnace about the first axis in the second direction by the first angle, so that the smelting furnace is restored from the first tilted state to the vertical state.

12. The vacuum casting method for fixed-point pouring according to claim 1, characterized in that, When the smelting furnace is in the completed state, the molten metal contained in the smelting furnace is less than 80% of the volume of the smelting furnace, so that the amount of molten metal flowing out of the smelting furnace during the process of the smelting furnace changing from a vertical state to the second inclined state is 0.

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