Automobile engine oil pan and forming process thereof

Abstract

The invention relates to the technical field of oil pan machining, and discloses an automobile engine oil pan and a forming process thereof.The forming process comprises the following steps that S1, plates of the corresponding specification and number are prepared, the plates are inspected, and it is ensured that the material, thickness, surface quality and the like of the plates meet production requirements; s2, a high-power optical fiber laser cutting machine with high-precision positioning and high-speed cutting capabilities is adopted, and according to a preset precise cutting path; s3, the cut plates are fed into a multi-station punching machine, and step-by-step preforming is achieved through a plurality of continuous stations; the multi-station progressive pre-stamping and variable-parameter dynamic stamping technology is adopted, process parameters are flexibly adjusted according to the forming difficulty of all parts of the engine oil pan, local hot shape correction is matched, the problem that a complex curved surface and a reinforcing rib structure cannot be accurately formed through a traditional stamping die is effectively solved, the product size precision is improved by 40% or above compared with a traditional process, and the product quality is improved. And the assembling suitability with the engine is guaranteed, and the overall performance of the engine can be stably exerted.

Description

Technical Field

[0001] The present invention relates to the technical field of oil pan processing, and particularly to an automobile engine oil pan and its forming process. Background Technique

[0002] Currently, in the field of automotive parts manufacturing, the stamping process is the mainstream choice for producing oil pans. However, with the rapid development of the automotive industry, the design of oil pans has evolved towards more complex structures. Traditional stamping dies show serious limitations when dealing with complex curved surfaces and ribbed structures, making it difficult to achieve precise forming. This directly leads to the product's dimensional accuracy failing to reach the ideal standard, and when assembled with the engine, the compatibility is greatly reduced, affecting the stable performance of the overall engine. From the perspective of the sheet metal forming process, the traditional stamping process has a serious problem of uneven sheet metal deformation. Under the stamping force, the stress states of different parts of the sheet metal are significantly different, resulting in stress concentration in some areas and prone to cracking; while in other areas, due to unreasonable material flow, wrinkling defects occur. According to statistics, under the traditional stamping process, the scrap rate of oil pans has long hovered between 15% and 20%, which undoubtedly increases production costs and reduces production efficiency. In terms of the process flow, the traditional stamping process relies on multi-step forming in multiple processes, from blanking, initial stamping, fine stamping, to subsequent shaping and other processes, with a long process flow. Each process not only takes a lot of time, but also the frequent switching and debugging of equipment between processes cause huge energy consumption. In the current context of the automotive industry's pursuit of high-efficiency and low-cost manufacturing, the traditional stamping process can no longer meet the growing market demand. Summary of the Invention

[0003] The purpose of the present invention is to provide an automobile engine oil pan and its forming process to solve the problems raised in the above background technique.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A forming process for an automobile engine oil pan, including the following steps: S1: Prepare sheets of corresponding specifications and quantities, and inspect the sheets to ensure that their material, thickness, surface quality, etc. meet the production requirements; S2: Use a high-power fiber laser cutting machine with high-precision positioning and high-speed cutting capabilities, according to a pre-set precise cutting path; S3: Feed the cut sheets into a multi-station stamping machine, and achieve step-by-step pre-forming through multiple consecutive stations. The blanks are automatically transferred between stations by a manipulator to achieve continuous production; S4: According to the forming difficulty of different parts of the oil pan, adjust the stamping pressure, speed, and die temperature in real time; S5: Use a high-frequency induction coil to quickly heat the parts with dimensional deviation after stamping to the recrystallization temperature of the aluminum alloy, and then apply pressure through a special correction die to correct the shape; S6: Shot peening process is used to treat the surface of the formed oil pan; S7: Use a drilling machine to process multi-position threaded connection holes on the oil pan, and use a laser welding machine to weld two sets of assembled quick-release structures on the outer wall of the oil pan at the positions corresponding to the threaded connection holes.

[0005] Preferably, the cutting speed of the fiber laser cutting machine in S2 is 5-8 m / min, the laser power is 2000-3000 W, the incision width is controlled at 0.1-0.2 mm, and the incision verticality error is less than ±0.05 mm.

[0006] Preferably, the multiple continuous workstations in S3 include a first workstation that uses a shallow drawing process to initially draw the plate into a basin-shaped structure, with the drawing depth controlled at 30% to 40% of the design depth; a second workstation that performs preliminary forming of the side wall, and controls the side wall angle error to ±1° by adjusting the mold gap and stamping pressure; and a third workstation that performs pre-indentation treatment on the bottom rib area, with the pre-indentation depth being 50% of the design rib depth.

[0007] Preferably, the stamping pressure and speed in S4 are 300-500MPa and 5-10mm / s respectively at the initial stage of stamping. In the critical stage of forming, the stamping speed is increased to 15-20mm / s, the pressure is increased to 800-1200MPa, and the mold temperature in S4 is controlled at 150-200℃.

[0008] Preferably, the shot peening process in S6 uses stainless steel shots with a diameter of 0.3-0.5 mm to spray the surface of the oil pan at a spray speed of 30-50 m / s to form a residual compressive stress layer on the surface, and the shot peening time is controlled at 5-10 min.

[0009] Preferably, the quick-release structure in S7 includes a positioning shell, a stepped shaft, a rotating block, a fastening bolt, a connecting piece and a transmission pulley, the positioning shell is integrally welded to both sides of the outer wall of the oil pan, the stepped shaft and the positioning shell are rotatably connected through bearings, the rotating block is fixed to the bottom end of the stepped shaft, the non-threaded end of the fastening bolt is slidably connected to the inside of the rotating block, the external thread of the fastening bolt is matched with the threaded connecting hole on the oil pan, the rotating block is rotatably connected to the oil pan through the connecting piece, the stepped shafts are provided in multiple groups, each group of the stepped shafts is fixedly sleeved with a transmission pulley, and the multiple transmission pulleys are connected by synchronous belt transmission.

[0010] Preferably, the connecting member includes an inner ring, an outer ring, a first connecting rod and a second connecting rod. The bottom of the inner ring is fixed outside the threaded connection hole on the oil pan through the first connecting rod. The top of the outer ring is connected to the bottom of the rotating block through the second connecting rod. A plurality of rollers are evenly engaged between the inner ring and the inner ring. The outer ring is rotatably connected to the outside of the inner ring through the rollers. The fastening bolt is in transitional fit with the inner ring.

[0011] Preferably, a driving screw is rotatably connected to the middle position at the top of the positioning shell. A driving block is threadedly connected to the outside of the driving screw. Rotating rods are hinged to both ends of the driving block. A moving block is hinged to the end of the rotating rod far from the driving block. A limiting insertion rod is fixed to one side of the moving block. A jack adapted to the limiting insertion rod is provided on the outside of the stepped shaft. A guide rail is fixed to the top of the positioning shell. The bottom of the moving block is slidably connected to the guide rail.

[0012] Preferably, a handle is fixedly connected to the top of the driving screw. An internal hexagonal block is fixed to the top end of one of the stepped shafts.

[0013] An automobile oil pan is prepared by the forming process of the above-mentioned automobile oil pan.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] 1. The present invention adopts multi-station progressive pre-stamping and variable-parameter dynamic stamping technologies, flexibly adjusts process parameters according to the forming difficulty of each part of the oil pan, and cooperates with local thermal straightening, effectively solving the problem that traditional stamping dies are difficult to accurately form complex curved surfaces and rib structures, improving the product size accuracy by more than 40% compared with the traditional process, ensuring the assembly adaptability with the engine, and facilitating the stable performance of the overall engine performance.

[0016] 2. In the present invention, a quick-release structure is assembled outside the formed oil pan, which can realize the quick installation and disassembly of the oil pan, greatly improving the maintenance efficiency and convenience of the oil pan. The quick-release structure adopts a standardized design, is suitable for a variety of vehicle models, reduces the maintenance cost, and at the same time ensures the installation stability and sealing performance, effectively preventing oil leakage, extending the service life of the oil pan and the engine. In addition, the introduction of the quick-release structure also makes the cleaning and inspection of the oil pan simpler, helping to detect and eliminate potential faults in time, and ensuring the safe operation of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the process flow chart of the forming process of the automobile oil pan of the present invention; Figure 2 is the overall structure schematic diagram of the oil pan in the present invention; Figure 3 This is the disassembly diagram of the oil pan and the quick-release structure of the present invention; Figure 4 This is a partial schematic diagram of the quick-release structure of the present invention; Figure 5 This is the connection schematic diagram of the fastening bolt and the rotating block of the present invention; Figure 6 This is the structural schematic diagram of the connecting piece of the present invention; Figure 7 This is a partial structural schematic diagram of the present invention.

[0018] In the figure: 1, positioning shell; 2, stepped shaft; 3, rotating block; 4, fastening bolt; 5, connecting piece; 6, drive pulley; 7, inner ring; 8, outer ring; 9, first connecting rod; 10, second connecting rod; 11, roller; 12, drive screw; 13, drive block; 14, rotating rod; 15, moving block; 16, limit insertion rod; 17, insertion hole; 18, guide rail; 19, handle; 20, hexagon socket block. Specific Embodiments

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0020] Embodiment 1: Please refer to Figure 1 , a forming process of an automobile oil pan in the figure, including the following steps: S1: Prepare plates of corresponding specifications and quantities, and inspect the plates to ensure that their material, thickness, surface quality, etc. meet the production requirements; S2: Use a high-power fiber laser cutting machine with high-precision positioning and high-speed cutting capabilities to perform efficient and stable edge cutting operations on high-strength aluminum alloy plates according to a pre-set precise cutting path, ensuring that the cutting edges are neat and burr-free, meeting the strict requirements of subsequent stamping forming processes; S3: Feed the cut plates into a multi-station stamping machine, and achieve step-by-step pre-forming through multiple consecutive stations. The blanks are automatically transferred between stations by a manipulator to achieve continuous production, effectively improving production efficiency and reducing manual operation errors at the same time. Each stamping station is equipped with a precision mold to ensure that the plates are accurately formed according to the design requirements, laying a solid foundation for subsequent processing steps; S4: According to the forming difficulty of different parts of the oil pan, adjust the stamping pressure, speed, and die temperature in real time to ensure uniform force on each part and avoid deformation problems caused by over-stamping or under-stamping. In complex structural parts, such as corners and protrusions, appropriately increase the stamping pressure, while maintain a moderate pressure in flat areas to ensure the uniformity and accuracy of the overall forming. At the same time, by precisely controlling the die temperature, the thermal stress of the material during stamping can be effectively reduced, improving the forming quality and dimensional stability of the oil pan; S5: Use a high-frequency induction coil to quickly heat the parts with dimensional deviations after stamping to the recrystallization temperature of aluminum alloy, and then apply pressure through a special shaping die for shaping, effectively correcting the dimensional deviations of the oil pan, improving the dimensional accuracy and overall quality of the product. The high-frequency induction heating technology in this step can quickly and uniformly heat the specified area, ensuring the efficiency and accuracy of the shaping process; S6: Use shot peening technology to perform surface treatment on the formed oil pan. Impact the surface of the oil pan with high-speed sprayed shot particles to cause plastic deformation of the surface material, thereby improving its hardness and fatigue strength; S7: Use a drilling machine to process multi-position threaded connection holes on the oil pan, and use a laser welding machine to weld two sets of assembled quick-release structures on the outer wall of the oil pan corresponding to the positions of the threaded connection holes, which can achieve quick installation and disassembly of the oil pan, greatly improving the maintenance efficiency and convenience of the oil pan. The quick-release structure adopts a standardized design, adapts to a variety of vehicle models, reduces the maintenance cost, while ensuring the stability and sealing of the installation, effectively preventing oil leakage, and extending the service life of the oil pan and the engine. In addition, the introduction of the quick-release structure also makes the cleaning and inspection of the oil pan simpler, helping to detect and eliminate potential faults in a timely manner, and ensuring the safe operation of the vehicle.

[0021] In summary, by adopting multi-station progressive pre-stamping and variable parameter dynamic stamping technologies, flexibly adjusting process parameters according to the forming difficulty of each part of the oil pan, and cooperating with local thermal shaping, the problem that traditional stamping dies are difficult to accurately form complex curved surfaces and ribbed structures is effectively solved. The dimensional accuracy of the product is improved by more than 40% compared with the traditional process, ensuring the assembly compatibility with the engine and facilitating the stable performance of the overall engine performance.

[0022] Furthermore, the cutting speed of the fiber laser cutting machine in S2 is 5 - 8 m / min, the laser power is 2000 - 3000 W, the cut width is controlled within 0.1 - 0.2 mm, and the perpendicularity error of the cut is less than ±0.05 mm, making the cutting surface smooth and burr-free, without the need for secondary processing, effectively improving the production efficiency. At the same time, the high-precision cutting ability of the fiber laser cutting machine ensures the accuracy of the dimensions of each component of the oil pan, providing a strong guarantee for subsequent assembly and use.

[0023] Furthermore, the multiple continuous workstations in S3 include a first workstation that uses a shallow drawing process to initially draw the sheet into a basin-shaped structure, with the drawing depth controlled at 30% to 40% of the design depth; a second workstation that performs preliminary forming of the side wall, and controls the side wall angle error to ±1° by adjusting the mold gap and stamping pressure; and a third workstation that performs pre-indentation treatment on the bottom rib area, with the pre-indentation depth being 50% of the design rib depth.

[0024] Furthermore, the stamping pressure and speed in S4 are 300-500MPa and 5-10mm / s respectively at the beginning of stamping, so that the sheet fits the mold cavity. In the critical stage of forming, the stamping speed is increased to 15-20mm / s and the pressure is increased to 800-1200MPa to ensure the precise forming of complex structures (such as reinforcing ribs, heat dissipation holes, etc.). The mold temperature in S4 is controlled at 150-200℃ to reduce the deformation resistance of the sheet and reduce the risk of cracking. Furthermore, the shot peening process in S6 uses stainless steel shots with a diameter of 0.3-0.5 mm to spray the surface of the oil pan at a spray speed of 30-50 m / s to form a residual compressive stress layer on the surface to improve the surface hardness and fatigue strength. The shot peening time is controlled at 5-10 minutes to ensure that the surface coverage rate reaches 100%.

[0025] Example 2: Please refer to Figure 2 - Figure 6 This embodiment further explains the first embodiment, and the difference lies in that the installation and removal steps of the oil pan are optimized.

[0026] Specifically, the quick-release structure in S7 includes a positioning shell 1, a stepped shaft 2, a rotating block 3, a fastening bolt 4, a connecting piece 5 and a driving pulley 6. The positioning shell 1 is integrally welded to both sides of the outer wall of the oil pan. The stepped shaft 2 and the positioning shell 1 are rotatably connected through bearings. The rotating block 3 is fixed to the bottom end of the stepped shaft 2. The non-threaded end of the fastening bolt 4 is slidably connected to the inside of the rotating block 3. The external thread of the fastening bolt 4 is matched with the threaded connection hole on the oil pan. The rotating block 3 is rotatably connected to the oil pan through the connecting piece 5. The stepped shafts 2 are provided in multiple groups. A driving pulley 6 is fixedly sleeved on each group of the stepped shafts 2. The multiple driving pulleys 6 are connected through synchronous belt transmission. A hexagonal block 20 is fixed to the top of one of the stepped shafts 2. Meanwhile, the connecting member 5 includes an inner ring 7, an outer ring 8, a first connecting rod 9 and a second connecting rod 10. The bottom of the inner ring 7 is fixed to the outside of the threaded connection hole on the oil pan through the first connecting rod 9. The top of the outer ring 8 is connected to the bottom of the rotating block 3 through the second connecting rod 10. A plurality of rollers 11 are evenly engaged between the inner ring 7 and the inner ring 7. The outer ring 8 is rotatably connected to the outside of the inner ring 7 through the rollers 11. The fastening bolt 4 and the inner ring 7 are in transitional fit. Since the rotating block 3 drives the outer ring 8 to rotate and the inner ring 7 does not rotate, the accuracy of the fastening bolt 4 during rotation and movement will be higher and there will be no wobbling.

[0027] Specifically, after the oil pan is formed, the quick-release structure is welded to the oil pan. Then, an inner hexagonal wrench is used to rotate the inner hexagonal block 20 at the top of the stepped shaft 2, driving the rotating block 3 to rotate, so that the fastening bolt 4 moves and rotates inside the rotating block 3, and the external thread of the fastening bolt 4 is pre-inserted into the threaded connection hole of the oil pan. Since a plurality of stepped shafts 2 are connected by multiple sets of belt pulleys 6, a plurality of fastening bolts 4 will move and rotate simultaneously, ensuring that all the fastening bolts 4 can be pre-connected to the threaded connection holes on the oil pan; since the existing installation method is for personnel to screw each bolt one by one, when connecting the oil pan and the engine in this way, the fastening bolts 4 at multiple positions can rotate simultaneously, thereby improving the connection efficiency between the oil pan and the engine; in addition, the introduction of the quick-release structure also makes the cleaning and inspection of the oil pan simpler, helping to detect and eliminate potential faults in a timely manner and ensuring the safe operation of the vehicle.

[0028] Embodiment Three: Please refer to Figure 4 and Figure 7 , this embodiment further illustrates Embodiment Two, and the difference lies in optimizing the use effect of the quick-release structure.

[0029] Specifically, a driving screw 12 is rotatably connected to the middle position at the top of the positioning shell 1. A driving block 13 is threadedly connected to the outside of the driving screw 12. Both ends of the driving block 13 are hinged with a rotating rod 14. One end of the rotating rod 14 away from the driving block 13 is hinged with a moving block 15. A limiting insertion rod 16 is fixed to one side of the moving block 15. A jack 17 adapted to the limiting insertion rod 16 is provided on the outside of the stepped shaft 2. A guide rail 18 is fixed to the top of the positioning shell 1. The bottom of the moving block 15 is slidably connected to the guide rail 18. A handle 19 is fixedly connected to the top of the driving screw 12.

[0030] After the oil pan is installed, by rotating the driving screw rod 12, the driving screw rod 12 drives the driving block 13 to move downward, so as to drive the two moving blocks 15 to move away from each other through the rotating rods 14 at both ends, and insert the limiting plug rods 16 at both ends into the jacks 17 of the stepped shaft 2, thereby realizing the locking effect on the stepped shafts 2 on both sides and preventing the stepped shafts 2 from rotating caused by external forces; In addition, when it is necessary to move or carry the oil pan, since the stepped shaft 2 has been firmly fixed, the operator only needs to simply lift the handle 19, and the entire oil pan can be stably lifted through the quick-release structure composed of the driving screw rod 12, the driving block 13, the rotating rod 14 and the moving block 15, as well as the cooperation between the limiting plug rod 16 and the jack 17 of the stepped shaft 2. This design not only improves the convenience of carrying the oil pan, but also ensures the safety during the carrying process, avoiding potential risks caused by the shaking or slipping of the oil pan. At the same time, the optimized design of the quick-release structure also enables the oil pan to be quickly disassembled when necessary by reversely rotating the handle 19 to disengage the limiting plug rod 16 from the jack 17, thereby unlocking the stepped shaft 2 and facilitating subsequent disassembly work.

[0031] An automobile oil pan is prepared by the forming process of the above-mentioned automobile oil pan.

[0032] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device.

[0033] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A forming process for an automobile oil pan, characterized in that: The steps include the following: S1: Prepare the plates with corresponding specifications and quantities, and inspect the plates to ensure that their materials, thicknesses, surface qualities, etc. meet the production requirements; S2: Adopt a high-power fiber laser cutting machine with high-precision positioning and high-speed cutting capabilities, and according to the pre-set precise cutting path; S3: Feed the cut plates into a multi-station stamping machine, and realize step-by-step pre-forming through multiple consecutive stations. The blanks are automatically transported between stations by a manipulator to achieve continuous production; S4: According to the forming difficulties of different parts of the oil pan, adjust the stamping pressure, speed and die temperature in real time; S5: Use a high-frequency induction coil to quickly heat the parts with dimensional deviations after stamping to the recrystallization temperature of aluminum alloy, and then apply pressure through a special sizing die for sizing; S6: Adopt a shot peening process to perform surface treatment on the formed oil pan; S7: Use a drilling machine to process multiple threaded connection holes on the oil pan, and use a laser welding machine to weld two sets of assembled quick-release structures on the outer wall of the oil pan corresponding to the positions of the threaded connection holes.

2. The forming process of an automobile oil pan according to claim 1, characterized in that: In the fiber laser cutting machine in S2, the cutting speed is 5 - 8 m / min, the laser power is 2000 - 3000 W, the cut width is controlled within 0.1 - 0.2 mm, and the cut perpendicularity error is less than ±0.05 mm.

3. The forming process of an automobile oil pan according to claim 1, characterized in that: In S3, the multiple consecutive stations include that the first station adopts a shallow drawing process to initially draw the plate into a basin-shaped structure, and the drawing depth is controlled within 30% - 40% of the designed depth. The second station performs preliminary side wall forming, and by adjusting the die gap and stamping pressure, the side wall angle error is controlled within ±1°. The third station performs pre-indentation treatment on the bottom rib area, and the pre-indentation depth is 50% of the designed depth of the rib.

4. The forming process of an automobile oil pan according to claim 1, characterized in that: In S4, the stamping pressure and speed are 300 - 500 MPa and 5 - 10 mm / s respectively at the beginning stage of stamping. In the key stage of forming, the stamping speed is increased to 15 - 20 mm / s, and the pressure is increased to 800 - 1200 MPa. The die temperature in S4 is controlled within 150 - 200 °C.

5. The forming process of an automobile oil pan according to claim 1, characterized in that: In the shot peening process in S6, stainless steel shots with a diameter of 0.3 - 0.5 mm are used to spray the surface of the oil pan at a spraying speed of 30 - 50 m / s to form a residual compressive stress layer on the surface, and the shot peening time is controlled within 5 - 10 min.

6. The forming process of an automobile oil pan according to claim 1, characterized in that: The quick-release structure in S7 comprises a positioning shell (1), a stepped shaft (2), a rotating block (3), a fastening bolt (4), a connecting piece (5) and a driving pulley (6); the positioning shell (1) is integrally welded to both sides of the outer wall of the oil pan; the stepped shaft (2) and the positioning shell (1) are rotatably connected via a bearing; the rotating block (3) is fixed to the bottom end of the stepped shaft (2); the non-threaded end of the fastening bolt (4) is slidably connected to the inside of the rotating block (3); the external thread of the fastening bolt (4) is matched with a threaded connection hole on the oil pan; the rotating block (3) is rotatably connected to the oil pan via the connecting piece (5); the stepped shaft (2) is provided in a plurality of groups; each group of the stepped shafts (2) is fixedly sleeved with a driving pulley (6); and the plurality of driving pulleys (6) are connected via a synchronous belt transmission.

7. A forming process for an oil pan of an automobile according to claim 6, characterized in that: The connecting member (5) comprises an inner ring (7), an outer ring (8), a first connecting rod (9) and a second connecting rod (10); the bottom of the inner ring (7) is fixed to the outside of a threaded connection hole on the oil pan via the first connecting rod (9); the top of the outer ring (8) is connected to the bottom of the rotating block (3) via the second connecting rod (10); a plurality of rollers (11) are evenly engaged between the inner ring (7) and the inner ring (7); the outer ring (8) is rotatably connected to the outside of the inner ring (7) via the rollers (11); and the fastening bolts (4) and the inner ring (7) are transitionally matched.

8. The forming process of an automobile oil pan according to claim 6, characterized in that: A driving screw rod (12) is rotatably connected at the middle position of the top of the positioning shell (1), and a driving block (13) is threadedly connected to the outer side of the driving screw rod (12). Rotating rods (14) are hinged at both ends of the driving block (13), and a moving block (15) is hinged at one end of the rotating rod (14) away from the driving block (13). A limiting plug rod (16) is fixed to one side of the moving block (15), and a socket (17) adapted to the limiting plug rod (16) is provided on the outer side of the stepped shaft (2). A guide rail (18) is fixed to the top of the positioning shell (1), and the bottom of the moving block (15) is slidably connected to the guide rail (18).

9. The forming process of an automobile oil pan according to claim 8, characterized in that: A handle (19) is fixedly connected to the top of the driving screw rod (12), and a hexagonal block (20) is fixed to the top of one of the stepped shafts (2).

10. An oil pan of an automobile, characterized in that: The oil pan is prepared by the molding process of an automobile oil pan as described in any one of claims 1 to 9.

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