An unmanned loader steering gear housing casting mold and a manufacturing method thereof

Abstract

The application discloses an unmanned loader steering gear housing casting mold and a manufacturing method thereof, and relates to the technical field of molds.The mold comprises a base, an upper mold seat, a lower mold seat, a mold closing driving mechanism and a movable part.A lateral driving assembly for driving the movable part to slide in the accommodating cavity is arranged on the lower mold seat.An exhaust micro-hole penetrating through the accommodating cavity is arranged on the lower mold seat.In the application, the movable part is arranged on the lower mold seat and can slide, and a specific exhaust gap is reserved between the movable part and the inner wall of the accommodating cavity.The lateral driving assembly is used to push the movable part to move upwards after liquid injection, so that the metal liquid in the cavity can be actively extruded and the residual air can be forcedly extruded out.The air can be orderly discharged through the exhaust micro-hole, the problem that air is entrapped in the metal liquid to form bubbles due to poor exhaust of the traditional mold is solved, the compactness of the housing after molding is obviously improved, and the generation of surface pores or air gaps is reduced.

Description

Technical Field

[0001] This invention relates to the field of mold technology, specifically to a casting mold for the steering gear housing of an unmanned loader and its manufacturing method. Background Technology

[0002] Molds are various shapes and tools used in industrial production to obtain desired products through methods such as injection molding, blow molding, extrusion, die casting, forging, smelting, and stamping. In short, a mold is a tool used to create shaped objects. This tool is composed of various parts, and different molds are composed of different parts. It mainly achieves the shaping of objects by changing the physical state of the material being molded. It is often referred to as the "mother of industry."

[0003] The steering gear of an unmanned loader is a key component of the vehicle's steering system, and its housing is typically formed using a casting process. In existing steering gear housing casting molds, molten metal is injected after the mold is closed, and air inside the mold cavity needs to be expelled through an exhaust structure.

[0004] In existing technologies, venting holes are typically created on the mold for venting. However, patent publication number CN119387546 A discloses a steering housing die-casting mold that can eliminate porosity, comprising a base, a worktable, a work box, a mold assembly, and an injection component. The worktable is mounted on the base, the work box is mounted on the worktable, the mold assembly is mounted on the work box, and the injection component is mounted on the worktable. It also includes a movable seat that is slidably mounted on the worktable. This steering housing die-casting mold, through the cooperation of a triggering mechanism and a suction mechanism, can draw gas from the mold cavity during the die-casting process, thereby preventing porosity from forming inside the die-cast part.

[0005] However, existing technologies still have unavoidable limitations in actual mass casting production: on the one hand, due to the constraints of the overall mold structure layout and the irregular contour of the cavity, conventional venting holes are difficult to accurately set at the end of the flow of molten metal during filling. Most of them can only be opened in the middle area of ​​the cavity, which cannot fully match the natural convergence path of gas during filling. A large amount of stagnant gas cannot be smoothly discharged through the preset channel. On the other hand, the existing venting system has not formed a deep synergy with the injection process parameters. The actual filling flow rate of molten metal and the venting rate of the venting channel are in a mismatch state for a long time. Turbulent air entrapment is very likely to occur during filling, and a large amount of air is entrained into the interior of the molten metal to form tiny bubbles.

[0006] Meanwhile, after the molten metal enters the solidification stage, the feeding pressure inside the mold has a limited range of action. Air bubbles trapped inside the molten metal lack sufficient upward buoyancy and cannot completely escape from the melt. Ultimately, this results in closed pores or surface air gaps inside the formed steering gear housing, directly leading to insufficient density in the casting and severely weakening the structural strength and airtightness of the housing, failing to meet the high-precision casting quality requirements of the steering gear housing. Therefore, there is an urgent need for a steering gear housing casting mold that can effectively expel gas from the mold cavity. Summary of the Invention

[0007] The purpose of this invention is to provide a casting mold for the steering gear housing of an unmanned loader and a method for manufacturing the same, so as to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a casting mold for a steering gear housing of an unmanned loader, comprising a base, an upper mold base, a lower mold base, and a mold closing drive mechanism. The upper mold base and the lower mold base are correspondingly arranged and form a molding cavity. The lower mold base is provided with a receiving cavity communicating with the molding cavity. A movable part is slidably installed in the receiving cavity. The lower mold base is provided with a lateral drive assembly for driving the movable part to slide in the receiving cavity. An exhaust gap is provided between the periphery of the movable part and the inner wall of the receiving cavity. An exhaust microhole penetrating the receiving cavity is opened on the lower mold base.

[0009] Furthermore, the lateral drive assembly includes a hydraulic cylinder horizontally mounted on the lower mold base, a sliding column slidably disposed in a sliding groove of the lower mold base, and a transmission pin mechanism connecting the movable part and the sliding column, wherein the telescopic rod of the hydraulic cylinder is drivenly connected to the sliding column.

[0010] Furthermore, the transmission pin mechanism includes a connecting post fixed to the bottom of the movable part, the connecting post passing through the sliding groove, the sliding post having a clearance groove for the connecting post to pass through, a sliding pin fixedly passing through the end of the connecting post, and an oblong hole that mates with the sliding pin on the wall of the sliding post, the length direction of the oblong hole being set at an angle to the length direction of the sliding post.

[0011] Furthermore, an annular groove is provided around the periphery of the movable part, and a thermal expansion member is installed in the annular groove. A sealing ring is fitted on the thermal expansion member. After the thermal expansion member is heated and expanded, it can drive the sealing ring to squeeze the inner wall of the receiving cavity.

[0012] Furthermore, the thermal expansion element is made of brass, the sealing ring is made of high-temperature resistant material, and the outer diameter of the sealing ring at room temperature is smaller than the inner diameter of the receiving cavity.

[0013] Furthermore, the size of the exhaust gap is 0.1 mm to 0.15 mm.

[0014] Furthermore, the upper mold base is provided with a pouring channel, and the pouring channel is provided with a slidable sliding sealing part and a fixed sealing part. The fixed sealing part and the sliding sealing part are respectively provided with a first connecting port and a second connecting port that are staggered from each other. An elastic element for pushing the sliding sealing part toward the fixed sealing part is also installed in the pouring channel.

[0015] Furthermore, the elastic element is a spring, and the sliding seal can overcome the spring force and separate from the fixed seal under the thrust of the molten metal.

[0016] Furthermore, the mold closing drive mechanism includes a mounting plate, a mold closing cylinder, and a mold closing plate. The machine base and the mounting plate are connected by a column. The mold closing plate is slidably sleeved on the column. The mold closing cylinder drives the mold closing plate to lift and lower the upper mold base.

[0017] A method for manufacturing a casting mold for an unmanned loader steering gear housing, applied to the casting mold as described above, includes the following steps: S1. Machining the lower mold base, and machining a receiving cavity that communicates with the mold cavity and venting micro-holes that penetrate the receiving cavity on the lower mold base; S2. Fabricate the movable part, install thermal expansion parts and sealing rings around the movable part, and install the movable part into the receiving cavity to ensure that a pre-defined venting gap is formed between the movable part and the inner wall of the receiving cavity. S3. Install the lateral drive assembly, connect the hydraulic cylinder, sliding column and transmission pin mechanism to the moving part, and adjust the stroke of the hydraulic cylinder to control the sliding displacement of the moving part in the receiving cavity; S4. Assemble the upper mold base and the lower mold base. Install the sliding seal, the fixed seal, and the spring in the pouring channel of the upper mold base to ensure that the first connecting port and the second connecting port are staggered and sealed under the action of the spring.

[0018] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, by setting a slidable movable part in the lower mold base and maintaining a specific venting gap between the movable part and the receiving cavity, and cooperating with the lateral drive component to push the movable part upward after liquid injection, the molten metal in the cavity can be actively squeezed, and residual air can be forcefully expelled. Combined with venting micropores, air can be discharged in an orderly manner, effectively solving the problem of air being drawn into the molten metal and forming bubbles due to poor venting in traditional molds. This significantly improves the density of the shell after molding and reduces the generation of surface pores or air gaps. 2. In this invention, after the liquid injection is completed, the movable part moves upward and exerts a continuous squeezing effect on the molten metal, which is equivalent to replenishing and maintaining the pressure of the molten metal in the cavity. This helps to counteract the volume shrinkage during the solidification process of the molten metal, further improving the internal structure and appearance quality of the steering gear housing; 3. In this invention, the movable part is equipped with a thermal expansion component and a sealing ring. In the initial stage of molten metal injection, a gap exists between the sealing ring and the receiving cavity to facilitate venting. When the molten metal is injected and releases heat, the thermal expansion component expands due to heat, compressing the sealing ring and causing it to tightly adhere to the inner wall of the receiving cavity. This "venting first, sealing later" mechanism, achieved through temperature changes, ensures the smooth discharge of gas while preventing molten metal from seeping into the venting gap, thus ensuring the sealing performance of the casting process. 4. In this invention, the upper mold base has a sliding sealing part and a fixed sealing part, both supported by springs, within its pouring channel, with their openings offset from each other. During molten metal pouring, the pressure of the molten metal overcomes the spring force to open the channel; after pouring, the sliding sealing part resets and seals against the fixed sealing part under the combined action of the spring force and the thrust of the molten metal. This effectively prevents the molten metal in the molding cavity from overflowing from the pouring port, maintains the pressure within the cavity, and helps improve the molding quality of the casting. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a casting mold for a steering gear housing of an unmanned loader according to the present invention; Figure 2 for Figure 1 A schematic diagram showing the positional relationship of the structure from another perspective; Figure 3 This is a schematic diagram showing the positional relationship of the lower mold base, hydraulic cylinder, and movable part after assembly in this invention; Figure 4 for Figure 3 A schematic diagram showing the positional relationship of a local structure after it has been cut open. Figure 5 for Figure 4 A magnified schematic diagram of the positional relationship of a local structure at point A in the middle; Figure 6 for Figure 3 Schematic diagram of the positional relationships of the central structure after explosive decomposition; Figure 7 This is a schematic diagram showing the positional relationship between the upper mold base and the casting assembly in this invention; Figure 8 for Figure 7 A schematic diagram showing the positional relationship of a local structure after it has been cut open. Figure 9 for Figure 7 Schematic diagram of the positional relationships of the central structure after explosive decomposition; Figure 10 for Figure 9 A magnified schematic diagram of the positional relationship of the local structure at point B.

[0020] The following are explanations of the reference numerals in the figures: 1. Mold closing cylinder; 2. Mounting plate; 3. Mold closing template; 4. Column; 5. Hydraulic cylinder; 6. Sliding sleeve; 7. Lower mold base; 8. Machine base; 9. Upper mold base; 10. First cavity; 11. Movable part; 12. Second cavity; 13. Venting micro-hole; 14. Sliding column; 15. Sliding groove; 16. Waist-shaped hole; 17. Sliding pin; 18. Connecting column; 19. Sealing ring; 20. Receiving cavity; 21. Thermal expansion component; 22. Clearance groove; 23. Casting sleeve; 24. Molten metal inlet; 25. Sliding sealing part; 26. Fixed sealing part; 27. First connecting port; 28. Second connecting port; 29. ​​Spring. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figures 1-10 This invention provides a technical solution: a casting mold for the steering gear housing of an unmanned loader, comprising a base 8, four columns 4 vertically mounted on the top of the base 8, and a mounting plate 2 connected to the upper ends of the four columns 4. A mold closing cylinder 1 is vertically mounted on the mounting plate 2, and a mold closing template 3 is fixedly connected to the end of the telescopic rod of the mold closing cylinder 1. The mold closing template 3 has sliding holes for the columns 4 to pass through freely, and the columns 4 can slide freely within the sliding holes. The downward-facing side of the mold closing template 3 is secured by screws. The upper mold base 9 is connected to the machine base 8, and the lower mold base 7 is connected to the top of the machine base 8 by screws. The upper mold base 9 and the lower mold base 7 are correspondingly arranged, and the opposite surfaces of the upper mold base 9 and the lower mold base 7 are respectively provided with a first cavity 10 and a second cavity 12. When the opposite surfaces of the upper mold base 9 and the lower mold base 7 abut against each other, the first cavity 10 and the second cavity 12 can form a molding cavity. In addition, a sliding sleeve 6 is fixedly embedded on the mold plate 3. The sliding sleeve 6 is fitted on the column 4, and the sliding sleeve 6 and the column 4 form a sliding fit. Combination Figures 1 to 10 As shown, and please refer to the following: Figure 4 , Figure 5 and Figure 6The lower mold base 7 has a blind-hole type receiving cavity 20, which is connected to the second cavity 12. A movable part 11 is fitted inside the receiving cavity 20 and can slide freely within it. The contour of the top surface of the movable part 11 matches the contour of the inner wall of the second cavity 12, so that after the movable part 11 moves upward into place within the receiving cavity 20, the top surface of the movable part 11 coincides with the contour of the inner wall of the second cavity 12. In addition, the outer diameter of the movable part 11 is slightly smaller than the inner diameter of the receiving cavity 20. The dimensions are such that the gap between the periphery of the movable part 11 and the receiving cavity 20 is between 0.1mm and 0.15mm, which allows air to enter the molding cavity. The lower mold base 7 has venting micro-holes 13 penetrating the receiving cavity 20 on its wall. By providing a slidable movable part 11 in the lower mold base 7 and maintaining a specific venting gap between the movable part 11 and the receiving cavity 20, and cooperating with the lateral drive assembly to push the movable part 11 upward after liquid injection, the molten metal in the cavity can be actively squeezed, forcefully expelling any residual air. Combined with the venting micro-holes 13, air can be discharged in an orderly manner, effectively solving the problem of air being drawn into the molten metal and forming bubbles due to poor venting in traditional molds. This significantly improves the density of the molded shell and reduces the generation of surface pores or gaps.

[0023] Combination Figures 1 to 10 As shown, and please refer to the following: Figure 4 , Figure 5 and Figure 6 A connecting post 18 is coaxially fixed to the downward-facing side of the movable part 11. The connecting post 18 passes through the lower mold base 7 and can slide freely on the lower mold base 7. A sliding groove 15 is horizontally provided on the lower mold base 7. The lower end of the connecting post 18 extends into the sliding groove 15. A sliding post 14 is inserted and installed in the sliding groove 15. A clearance groove 22 is provided on the sliding post 14 to allow the connecting post 18 to pass freely. A sliding pin 17 is horizontally fixed through the lower end of the connecting post 18. In addition, a sliding pin 17 is provided on the wall of the sliding post 14 to allow the sliding pin 17 to pass through. 7. The oblong hole 16 is inserted, and the length direction of the oblong hole 16 is at an angle to the length direction of the sliding column 14. The sliding pin 17 can slide freely in the oblong hole 16. In addition, a hydraulic cylinder 5 is horizontally installed on the wall of the lower mold base 7. The telescopic rod of the hydraulic cylinder 5 passes through the sliding groove 15 and is driven to connect with the sliding column 14. Thus, when the telescopic rod of the hydraulic cylinder 5 extends or retracts, it can drive the sliding column 14 to move horizontally linearly in the sliding groove 15, and make the sliding pin 17 slide in the oblong hole 16. Combination Figures 1 to 10 As shown, and please refer to the following: Figure 4 , Figure 5 and Figure 6The movable part 11 has a coaxial annular groove around its periphery, in which a thermal expansion member 21, made of brass, is fitted. A high-temperature resistant sealing ring 19 is fixedly fitted around the periphery of the thermal expansion member 21. The outer diameter of the sealing ring 19 at room temperature is slightly smaller than the inner diameter of the receiving cavity 20. When the thermal expansion member 21 is heated, it expands, causing the sealing ring 19 to elastically expand and press against the inner wall of the receiving cavity 20. The movable part is equipped with the thermal expansion member 21 and the sealing ring 19. In the initial stage of molten metal injection, there is a gap between the sealing ring 19 and the receiving cavity 20 to facilitate venting. When the molten metal is injected and releases heat, the thermal expansion member 21 expands due to heat, pressing against the sealing ring 19 and making it tightly fit against the inner wall of the receiving cavity 20. This "venting first, sealing later" mechanism, achieved through temperature changes, ensures the smooth discharge of gas and prevents molten metal from seeping into the venting gap, thus ensuring the sealing of the casting process. Combination Figures 1 to 10 As shown, and please refer to the following: Figures 7 to 10 The upper mold base 9 has a blind hole-shaped connecting cavity on its side wall, and a molten metal inlet 24 penetrating the connecting cavity and the first cavity 10 is provided on the upper mold base 9. A fixed sealing part 26 is fixedly installed at the opening of the connecting cavity, and a sliding sealing part 25 is also engaged and installed inside the connecting cavity. The sliding sealing part 25 can slide freely along the axial direction of the connecting cavity. At least one first connecting port 27 is provided on the end face of the fixed sealing part 26, and the first connecting port 27 penetrates the two axial end faces of the fixed sealing part 26. At least one second connecting port 28 is provided on the end face of the sliding sealing part 25. The sliding seal 25 is penetrated by two shaft end faces. The first connecting port 27 and the second connecting port 28 are staggered, so that when the sliding seal 25 moves towards the fixed seal 26, the end faces of the sliding seal 25 and the fixed seal 26 abut against each other, forming a seal. A casting sleeve 23 is also installed on the side wall of the upper mold base 9. The inner hole of the casting sleeve 23 is connected to the connecting cavity. A spring 29 is installed inside the connecting cavity. The spring 29 elastically abuts against the sliding seal 25 and exerts an elastic abutting force on the sliding seal 25 towards the fixed seal 26. During molten metal injection, the pressure of the molten metal overcomes the force of the spring 29 to open the channel. After injection, under the combined action of the spring 29 force and the molten metal thrust, the sliding seal 26 resets and seals against the fixed seal 26, effectively preventing the molten metal in the molding cavity from overflowing from the pouring port, maintaining the pressure within the cavity, and improving the molding quality of the casting. Working principle of the invention: The mold closing cylinder 1 drives the mold closing plate 3 to move downward, so that the upper mold base 9 and the lower mold base 7 abut against each other, and the first cavity 10 and the second cavity 12 form a molding cavity. The external molten metal enters the connecting cavity through the casting sleeve 23. The thrust of the molten metal will drive the sliding sealing part 25 to move away from the fixed sealing part 26, and make the sliding sealing part 25 disengage from the state of abutting against the end face of the fixed sealing part 26, so that the molten metal can enter the molten metal inlet 24 from the first connecting port 27 and the second connecting port 28, and can enter the molding cavity. At this time, the movable part 11 is retracted into the receiving cavity 20, allowing some of the molten metal in the molding cavity to enter the receiving cavity 20. After the molten metal is injected, the hydraulic cylinder 5 is activated, and the telescopic rod of the hydraulic cylinder 5 is shortened, thereby driving the sliding pin 17 to slide in the waist-shaped hole 16. The sliding pin 17 slides from the upper side to the lower side in the length direction of the waist-shaped hole 16, thereby causing the movable part 11 to slide upward in the receiving cavity 20. During the upward sliding process, the movable part 11 can generate a squeezing effect on the molten metal in the molding cavity, thereby allowing the molten metal in the molding cavity to generate a squeezing effect on the air in the molding cavity. This is equivalent to compressing and maintaining the pressure of the molten metal in the cavity. This allows the air to enter the receiving cavity 20 from the gap between the movable part 11 and the inner wall of the receiving cavity 20, and then be discharged from the exhaust micro-hole 13. This helps to counteract the volume shrinkage during the solidification process of the molten metal, further improving the internal structure and appearance quality of the steering gear housing. During this process, the molten metal in the molding cavity will exert a pushing force on the sliding seal 25, and under the action of the elastic resisting force of the spring 29, the sliding seal 25 will move towards the fixed seal 26 until the sliding seal 25 abuts against the end face of the fixed seal 26. This prevents the molten metal in the molding cavity from overflowing from the casting sleeve 23, making the molten metal in the molding cavity more compact, which can maximize the compression of air in the molding cavity. The molten metal is exothermic during the solidification process, so the thermal expansion member 21 will expand in volume due to the heat, causing the thermal expansion member 21 to compress the sealing ring 19, which in turn compresses the inner wall of the receiving cavity 20 and fills the gap between the receiving cavity 20 and the sealing ring 19, resulting in a better sealing effect of the molding cavity. After the air in the molding cavity is discharged, the sealing ring 19 has completely filled the gap between the receiving cavity 20 and the sealing ring 19.

[0024] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A casting mold for a steering gear housing of an unmanned loader, comprising a base (8), an upper mold base (9), a lower mold base (7), and a mold closing drive mechanism, wherein the upper mold base (9) and the lower mold base (7) are correspondingly arranged and form a molding cavity, characterized in that, The lower mold base (7) is provided with a receiving cavity (20) communicating with the molding cavity. A movable part (11) is slidably installed in the receiving cavity (20). The lower mold base (7) is provided with a lateral driving assembly for driving the movable part (11) to slide in the receiving cavity (20). An exhaust gap is provided between the periphery of the movable part (11) and the inner wall of the receiving cavity (20). An exhaust microhole (13) penetrating the receiving cavity (20) is opened on the lower mold base (7).

2. The casting mold for the steering gear housing of an unmanned loader according to claim 1, characterized in that, The lateral drive assembly includes a hydraulic cylinder (5) horizontally mounted on the lower mold base (7), a sliding column (14) slidably disposed in the sliding groove (15) of the lower mold base (7), and a transmission pin mechanism connecting the movable part (11) and the sliding column (14). The telescopic rod of the hydraulic cylinder (5) is drivenly connected to the sliding column (14).

3. The casting mold for the steering gear housing of an unmanned loader according to claim 2, characterized in that, The transmission pin mechanism includes a connecting post (18) fixed to the bottom of the movable part (11), the connecting post (18) passing through the sliding groove (15), the sliding post (14) having a clearance groove (22) for the connecting post (18) to pass through, the end of the connecting post (18) being fixedly provided with a sliding pin (17), the wall of the sliding post (14) having an oblong hole (16) that mates with the sliding pin (17), the length direction of the oblong hole (16) being set at an angle to the length direction of the sliding post (14).

4. The casting mold for the steering gear housing of an unmanned loader according to claim 1, characterized in that, The movable part (11) has an annular groove around its periphery. A thermal expansion member (21) is installed in the annular groove. A sealing ring (19) is fitted on the thermal expansion member (21). When the thermal expansion member (21) is heated and expanded, it can drive the sealing ring (19) to squeeze the inner wall of the receiving cavity (20).

5. A casting mold for a steering gear housing of an unmanned loader according to claim 4, characterized in that, The thermal expansion member (21) is made of brass, and the sealing ring (19) is made of high temperature resistant material. The outer diameter of the sealing ring (19) at room temperature is smaller than the inner diameter of the receiving cavity (20).

6. A casting mold for a steering gear housing of an unmanned loader according to claim 1, characterized in that, The size of the exhaust gap is 0.1 mm to 0.15 mm.

7. A casting mold for a steering gear housing of an unmanned loader according to claim 1, characterized in that, The upper mold base (9) is provided with a pouring channel. The pouring channel is provided with a sliding sealing part (25) and a fixed sealing part (26) that is fixedly installed. The fixed sealing part (26) and the sliding sealing part (25) are respectively provided with a first connecting port (27) and a second connecting port (28) that are staggered from each other. The pouring channel is also provided with an elastic element for pushing the sliding sealing part (25) towards the fixed sealing part (26).

8. A casting mold for a steering gear housing of an unmanned loader according to claim 7, characterized in that, The elastic element is a spring (29), and the sliding seal (25) can overcome the elastic force of the spring (29) and separate from the fixed seal (26) under the thrust of the molten metal.

9. A casting mold for a steering gear housing of an unmanned loader according to claim 1, characterized in that, The mold closing drive mechanism includes a mounting plate (2), a mold closing cylinder (1), and a mold closing plate (3). The machine base (8) is connected to the mounting plate (2) through a column (4). The mold closing plate (3) is slidably sleeved on the column (4). The mold closing cylinder (1) drives the mold closing plate (3) to drive the upper mold base (9) to rise and fall.

10. A method for manufacturing a casting mold for an unmanned loader steering gear housing, applied to the casting mold according to any one of claims 1 to 9, characterized in that, Includes the following steps: S1. Machining the lower mold base (7), and machining a receiving cavity (20) that communicates with the cavity and an exhaust micro-hole (13) that penetrates the receiving cavity (20) on the lower mold base (7). S2. Make the movable part (11), install the thermal expansion part (21) and sealing ring (19) around the movable part (11), and put the movable part (11) into the receiving cavity (20) to ensure that a predetermined exhaust gap is formed between the movable part (11) and the inner wall of the receiving cavity (20); S3. Install the lateral drive assembly, connect the hydraulic cylinder (5), sliding column (14) and transmission pin mechanism to the movable part (11), and adjust the stroke of the hydraulic cylinder (5) to control the sliding displacement of the movable part (11) in the receiving cavity (20); S4. Assemble the upper mold base (9) and the lower mold base (7). Install the sliding seal (25), the fixed seal (26) and the spring (29) in the pouring channel of the upper mold base (9) to ensure that the first connecting port (27) and the second connecting port (28) are staggered and sealed under the action of the spring (29).

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