A method for manufacturing a large shielded motor flywheel housing

Abstract

The present application relates to the technical field of machining, in particular to a manufacturing method of a flywheel housing of a large shielding motor, which forms a waist hole shape by rough rolling of a plate material, and forms an interruption on one side waist of the waist hole shape on the two sides of the plate material, and then butt welds the two sides of the flywheel housing, the straight edge is easier to position, align and fit, and the weld is more uniform and stable when welding the straight edge, and the stress at the weld is more stable, which can reduce the deformation caused by stress concentration during welding, and then the plate material is precisely rolled, and the stress at the weld of the flywheel housing can be fully released and eliminated during the precise rolling process, so that the flywheel housing is more stable and balanced as a whole, the size precision of the flywheel housing formed by rolling is higher, and the stability is stronger, which can improve the effect of the flywheel housing in actual use.

Description

Technical Field

[0001] This invention relates to the field of machining technology, specifically to a method for manufacturing a large shielded motor flywheel housing. Background Technology

[0002] Flywheel housings are commonly used casing components in motors, pumps, and other fields. Flywheel housings for large shielded motors are typically made by rolling sheet metal and welding the two ends together. The quality of the weld seam is a crucial factor affecting the overall quality of the flywheel housing, directly impacting the quality of the final product after production. However, current manufacturing processes, where sheet metal is directly rolled and welded, not only easily lead to stress concentration within the metal of the formed flywheel housing, causing significant deformation and affecting its use, but also make it difficult to guarantee high-quality welding of the butt joints between the two bent edges, resulting in a high defect rate.

[0003] Therefore, there is a need to propose a manufacturing method for a large shielded motor flywheel housing that can improve the welding quality and forming quality of the flywheel housing. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides a method for manufacturing a large shielded motor flywheel housing, comprising: S1. Prepare sheet metal for manufacturing the flywheel housing; S2. The board is rough rolled to form a waist-shaped hole, and straight edges are reserved at both ends of the board. The straight edges at both ends of the board are discontinuous at one waist of the waist-shaped hole, and the ends of the straight edges at both ends of the board are close to each other. S3. Butt weld the ends of the two straight edges reserved on the plate. S4. The sheet metal is precision rolled to form a cylindrical flywheel housing.

[0005] Preferably, in S1, milling is used to manufacture the sheet metal.

[0006] Preferably, in S2, the plate is rough rolled by a plate rolling machine, which includes clamping rollers, a front roller, and a rear roller. The clamping rollers include an upper clamping roller and a lower clamping roller. The plate is clamped and conveyed based on the rotation of the upper clamping roller and the lower clamping roller. The front roller and the rear roller are respectively located on both sides of the clamping roller along the direction of plate movement. The front roller and the rear roller are respectively used to cooperate with the clamping roller to roll the front and rear parts of the plate into two rounded edges in the shape of an oblong hole.

[0007] Preferably, S2 includes: S21. Draw lines on the board so that the board is divided into ten equal parts along its length; S22. Insert one end of the board parallel between the clamping rollers, and align the front edge of the board with the front roller. Rotate the clamping rollers to move the board forward until the board moves to the position where the clamping rollers clamp it at the first dividing line. S23. The clamping roller rotates to advance the board to the position where the clamping roller clamps the fourth dividing line. At the same time, the front roller is gradually raised. The clamping roller rotates to make the board reciprocate. The front roller performs rough rounding on the part of the board between the first and fourth dividing lines. S24. The clamping rollers rotate to advance the board to the position where the clamping rollers clamp the board at the sixth dividing line. At the same time, the rear roller is gradually raised. The rotation of the clamping rollers causes the board to reciprocate. The rear roller performs rough rounding on the part of the board between the sixth and ninth dividing lines.

[0008] Preferably, the portion between the front edge of the board and the first bisector is the front straight edge, the portion between the first bisector and the fourth bisector is the front rounded edge, the portion between the rear edge of the board and the ninth bisector is the rear straight edge, and the portion between the sixth bisector and the ninth bisector is the rear rounded edge. In S23, the rough rolling to the front round edge is a semi-circle. In S24, the rough rolling to the rear round edge is a semi-circle. The front straight edge and the rear straight edge of the plate form one side straight edge of the waist hole. The straight edge portion between the fourth and sixth bisectors of the plate forms the other side straight edge of the waist hole.

[0009] Preferably, in step S3, the plate is supported by welding support columns, and the plate is pressed and fixed onto the welding support columns by combined pressure plates, so that the straight edges on both sides of the plate are in the same plane, and then the straight edges on both sides of the plate are welded.

[0010] Preferably, in step S4, the plate is precision rolled by a plate rolling machine, the plate is clamped by clamping rollers, the clamping rollers rotate to make the plate reciprocate, and at the same time the front roller and the rear roller are slowly lifted to precision roll the plate into a flywheel shell.

[0011] Preferably, in step S4, during the fine rolling process of the sheet material, the sheet material is clamped by clamping rollers, and an external radial force is applied to the sheet material to form a reverse arc; during the fine rolling process, the sheet material is continuously rolled until the sheet material no longer oscillates when subjected to rolling.

[0012] Preferably, in step S4, the radius of the rounding formed by the precision rounding of the sheet metal is smaller than the target radius of the flywheel housing.

[0013] Preferably, the difference between the rounding radius value and the target radius value is determined by calculating the target radius value of the flywheel housing, the thickness value of the flywheel housing, and the material properties of the flywheel housing.

[0014] This invention provides a method for manufacturing a large shielded motor flywheel housing. The method involves roughly rolling a sheet metal into a waist-shaped form, with the straight edges at both ends of the sheet metal intermittently positioned at one side of the waist of the waist-shaped form. The straight edges at both ends of the flywheel housing are then butt-welded. This process makes the straight edges easier to position, align, and fit, resulting in a more uniform and stable weld. The stress (and welding stress) at the weld is also more stable, reducing deformation caused by stress concentration during welding. Subsequently, the sheet metal is precision rolled into a round shape. During this precision rolling process, the stress at the weld of the flywheel housing is fully released and eliminated, making the flywheel housing more stable and balanced overall. The resulting rounded flywheel housing has higher dimensional accuracy and stronger stability, improving its performance in actual use. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the position of the flywheel housing before rough rolling in the manufacturing method of the large shielded motor flywheel housing provided in this embodiment of the invention; Figure 2 This is a schematic diagram of the flywheel housing in the rough rolling process of the large shielded motor flywheel housing manufacturing method provided in the embodiment of the present invention; Figure 3 This is a schematic diagram of the flywheel housing in the rough rolling process of the large shielded motor flywheel housing manufacturing method provided in the embodiment of the present invention; Figure 4 This is a schematic diagram of the flywheel housing in the rough rolling process of the large shielded motor flywheel housing manufacturing method provided in the embodiment of the present invention; Figure 5 This is a schematic diagram of the flywheel housing in the rough rolling process of the large shielded motor flywheel housing manufacturing method provided in the embodiment of the present invention; Figure 6 This is a schematic diagram of the flywheel housing in the rough rolling process of the large shielded motor flywheel housing manufacturing method provided in the embodiment of the present invention; Figure 7 This is a schematic diagram of the flywheel housing in the rough rolling process of the large shielded motor flywheel housing manufacturing method provided in the embodiment of the present invention; Figure 8 This is a schematic diagram of the flywheel housing in the rough rolling process of the large shielded motor flywheel housing manufacturing method provided in the embodiment of the present invention; Figure 9 This is a schematic diagram of the welding process of the flywheel housing in the large shielded motor flywheel housing manufacturing method provided in this embodiment of the invention; Figure 10 This is a schematic diagram of the flywheel housing before precision rolling in the method for manufacturing a large shielded motor flywheel housing provided in this embodiment of the invention; Figure 11 This is a schematic diagram of the flywheel housing in the precision rolling process of the large shielded motor flywheel housing manufacturing method provided in this embodiment of the invention; Figure 12 This is a schematic diagram of the flywheel housing after precision rolling in the large shielded motor flywheel housing manufacturing method provided in this embodiment of the invention; Figure 13 This is a schematic diagram of the small bend formed on the shell wall of the flywheel housing in the large shielded motor flywheel housing manufacturing method provided in the embodiment of the present invention; Among them, 1. Plate; 11. Front straight edge; 12. Rear straight edge; 13. Weld seam; 14. Force application point; 15. Small bend; 16. Gap; 21. Upper clamping roller; 22. Lower clamping roller; 31. Front roller; 32. Rear roller; 41. Welded support column; 42. Combined pressure plate; 43. Support part. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, 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.

[0017] like Figures 1 to 13 As shown, the present invention provides a method for manufacturing a large shielded motor flywheel housing, comprising: S1. Prepare plate 1 for manufacturing flywheel housing. In S1, first determine the length, width and thickness of plate 1 according to the size of the flywheel housing to be prepared. Then, plate 1 of predetermined specifications can be made by cutting or other means. If necessary, the surface of plate 1 can be rough processed to make its shape and size more regular. S2. Roughly roll the board to form a waist-shaped hole, and leave straight edges at both ends of board 1, such as... Figure 2 The front straight edge 11 shown and Figure 8 The rear straight edge 12 shown, the front straight edge 11 and the rear straight edge 12 at both ends of the plate 1 form a discontinuity at one side of the waist of the waist-shaped hole, and the ends of the front straight edge 11 and the rear straight edge 12 are close to each other. S3. Butt welding is performed on the ends of the two straight edges pre-reserved on the flywheel housing. In S3, the ends of the two straight edges are butt welded together. Figure 8 The front straight edge 11 and rear straight edge 12 of the waist-shaped plate 1 shown are welded together to form... Figure 9 The weld 13 shown in the figure connects the plate 1 into a complete waist-shaped hole; S4. The board material is precision rolled into a round shape. In S4, the oblong-shaped board material 1 is precision rolled to achieve the desired shape. Figure 12 The circular flywheel casing shown.

[0018] The flywheel housing is manufactured using the above method. First, the sheet metal 1 is roughly rolled into a waist-shaped form. On one hand, the two rolling processes of roughly rolling the sheet metal 1 into a waist-shaped form and then fine rolling it into a circle can disperse the internal stress generated by the deformation of the sheet metal 1, reducing the deformation after subsequent forming, and reducing the small bends formed by the drastic changes in size and shape of the flywheel housing sheet metal, thus improving the stability of the shape and size of the sheet metal 1. On the other hand, rough rolling the sheet metal 1 into a waist-shaped form while retaining the front straight edge 11 and the rear straight edge 12 at both ends of the sheet metal 1, so that the ends of the two straight edges are opposite each other, makes it easier to operate during welding, and the resulting weld is more uniform, and the stress at the weld is more uniform and stable, which can improve the product quality of the flywheel housing after subsequent forming. Finally, the sheet metal 1 is fine rolled, which can eliminate and disperse some of the stress generated by welding while shaping the sheet metal 1, further reducing the deformation of the flywheel housing and improving product quality. Furthermore, after the rough rolling and welding of the sheet metal 1, it can be left to stand for a period of time to allow the stress inside the sheet metal 1 to be fully released, which can improve the stress distribution inside the sheet metal 1 and reduce deformation.

[0019] like Figure 1 As shown, in one preferred embodiment, when rough rolling the sheet 1, a plate rolling machine is used to rough roll the sheet 1. The plate rolling machine includes clamping rollers, a front roller 31, and a rear roller 32. The clamping rollers include an upper clamping roller 21 and a lower clamping roller 22, which clamp the sheet 1. When the upper clamping roller 21 and the lower clamping roller 22 rotate relative to each other, they can reciprocate pushing and pulling the sheet 1 along the tangential direction of its circumference. The front roller 31 and the rear roller 32 are located on both sides of the clamping rollers along the direction of sheet movement. The front roller 31 and the rear roller 32 are used to cooperate with the clamping rollers to roll the sheet 1 into two rounded edges in the shape of an oblong hole, as shown. Figures 2 to 4 As shown, the front roller 31, in conjunction with the clamping roller, rounds the front part of the plate 1 to form the first rounded edge of the waist-shaped hole, as shown. Figures 6 to 8 As shown, the rear roller 32, in conjunction with the clamping roller, rounds the rear part of the plate 1 to form the second rounded edge of the waist-shaped hole. By setting the clamping roller, the front roller 31, and the rear roller 32, the plate 1 can reciprocate on the plate rolling machine, and the entire process of rough rolling the plate 1 into the waist-shaped hole can be completed in just one clamping.

[0020] like Figures 1 to 13 As shown, in one preferred embodiment, during the rough rolling of the sheet material 1, lines are drawn on the sheet material so that the sheet material 1 is divided into ten equal parts along its length (i.e., nine dividing lines are evenly spaced along the length of the sheet material 1). The dividing lines are shown in the attached figure and labeled with lowercase letters a to i. After the rough rolling begins, one end of the sheet material 1 is inserted between the clamping rollers, and the front edge of the sheet material is closely aligned with the front roller 31. Figure 1 and Figure 2As shown, the clamping rollers rotate to advance the plate 1 until it reaches the position where the clamping rollers clamp it at the first bisector a. Then, the clamping rollers rotate to advance the plate 1 to the position where it clamps it at the fourth bisector d. While the plate 1 moves between these two positions, the front roller 31 is raised (as shown). Figure 4 As shown), the portion between the first dividing line a and the fourth dividing line d of the plate 1 is roughly rounded by the front roller 31 to form... Figure 5 The half-waisted hole shape is shown; the clamping roller rotates, causing the plate 1 to advance to the position where the clamping roller clamps it at the sixth bisector f. At the same time, the rear roller 32 is raised, and the clamping roller continues to rotate, causing the plate 1 to reciprocate. The rear roller 32 roughly rounds the portion of the plate 1 between the sixth bisector f and the ninth bisector i, forming a shape as shown. Figure 8 The other half of the waist-shaped hole is shown.

[0021] By dividing the plate 1 into equal parts by marking lines and then performing rough rolling, the rough rolling can be based on the dividing lines. After the rough rolling is completed, the part between the front end of the plate 1 and the first dividing line a is the front straight edge 11, and the part between the rear end of the plate 1 and the ninth dividing line i is the rear straight edge 12. The front straight edge 11 and the rear straight edge 12 are opposite each other. The straight edge of the waist hole on the other side is the part between the fourth dividing line d and the sixth dividing line f. Then, the straight edge part between the dividing lines d and f can be clamped to weld the front straight edge 11 and the rear straight edge 12, which makes the welding operation easier and can improve the welding quality.

[0022] Among them, marking lines on board 1 can be done simply using tools such as pens that are not easy to erase, or more precise marking can be done using equipment such as laser marking machines with scales. As long as the marking does not cause any additional impact on the mechanical structure of the board and the marking can remain clearly identifiable during the subsequent rough rolling process, it will not be elaborated here.

[0023] like Figure 9 As shown, in one preferred embodiment, when welding the plate 1 of the flywheel housing in S3, the lower parts of the front straight edge 11 and the rear straight edge 12 are supported by the welding support column 41, and the front straight edge 11 and the rear straight edge 12 of the plate 1 are pressed onto the welding support column 41 by the combined pressure plate 42. Then, the opposite parts of the front straight edge 11 and the rear straight edge 12 can be welded to form a weld 13, so that the plate 1 forms a complete waist hole shape.

[0024] Furthermore, it is also possible to use, such as Figure 9 The support portion 43 shown supports the other straight edge of the waist-shaped plate 1. By supporting the plate 1 with the support portion 43, the weight of the plate 1 that needs to be borne by the welding support column 41 can be reduced, and it is more conducive to keeping the front straight edge 11 and the rear straight edge 12 in a straight state (i.e., not to be bent from both sides by the weight of the plate 1), thereby improving the welding quality.

[0025] Of course, in addition to the above embodiments, other methods can also be used to weld the plate 1. Since two opposite straight edges have been formed in S2, welding the straight edges is a very mature technology in the field of mechanical manufacturing, which will not be elaborated here.

[0026] like Figure 10 and Figure 11 As shown, after welding, the sheet metal 1 of the flywheel housing is precision rolled using a plate rolling machine. Clamping rollers hold the sheet metal 1 in place, and their rotation causes it to reciprocate. Simultaneously, the front roller 31 and rear roller 32 are slowly raised, continuously rolling the sheet metal 1 until it no longer wobbles or vibrates under rolling pressure. This indicates that the sheet metal 1 has been precision rolled into shape. It should be noted that the wobbling and vibration mentioned here refer to the relatively large-amplitude wobbling and vibration caused by the sheet metal deforming under external force during the rolling process. In actual processing, due to limitations in mechanical precision, some minor vibrations are unavoidable regardless of the rolling method used. These minor vibrations or wobblings are not within the scope described above.

[0027] like Figure 11 As shown, in one preferred embodiment, an external force can be applied to the force application point 14 in a radial direction. This force can cause the plate 1 of the flywheel housing to form a small reverse arc before entering the roller rolling. This arc can fully straighten the plate 1 of the flywheel housing before entering the rolling, which can eliminate the small bend 15 caused by the excessive lifting speed of the front roller 31 or the rear roller 32, and further improve the efficiency and quality of rolling the plate 1. It should be noted that the force application point 14 is not a fixed point, but rather the part of the plate 1 that is about to enter the front roller 31 or rear roller 32 for rolling. The position of the force application point 14 and the magnitude of the applied force are generally determined based on the experience of the operators. When rolling plates with flywheel housings of different sizes and specifications, and at different rotational speeds of the clamping rollers or front and rear rollers, the corresponding force application point and force magnitude will also be different. Alternatively, experiments or simulations can be conducted based on the method provided by this invention to determine the optimal position and magnitude of the force application point for plates with flywheel housings of different sizes and the rolling parameters of the plate rolling machine. In summary, this invention provides the concept and approach, and the practical application based on this concept and approach can be determined by production personnel according to the actual situation.

[0028] like Figure 13 As shown, Figure 13The invention demonstrates that small bends 15 are easily formed in the sheet material 1 during roll forming. These small bends 15 can cause gaps 16 between the flywheel housing and the flywheel after it is fitted onto the flywheel or other components, affecting subsequent use. The method provided by this invention, through two roll forming processes of rough rolling and fine rolling, divides the direct, large-amplitude deformation of the sheet material 1 from a straight shape to a circle into two smaller-amplitude deformations: straight – waist-shaped – circular. This effectively reduces the small bends 15 that occur due to excessive roll forming. Furthermore, during fine rolling, force can be applied to the force point 14, causing a reverse bend to form on the sheet material 1 of the flywheel housing to counteract the small bends 15, thereby improving product quality and subsequent performance.

[0029] In one preferred embodiment, the rounding radius R formed by precision rolling of the sheet 1 is smaller than the target radius R0 of the flywheel housing. Since the sheet 1 experiences internal stress due to the significant deformation during rolling, it inevitably undergoes minor deformation after rolling. This deformation is generally outward expansion, slightly increasing its inner diameter. Therefore, setting the rounding radius R slightly smaller than the target radius R0 of the flywheel housing further improves the dimensional accuracy of the final flywheel housing. Furthermore, since the flywheel housing is typically heat-fitted onto components like the flywheel during actual use—that is, the flywheel housing is heated, and its inner diameter is slightly increased based on the principle of thermal expansion and contraction—it can fit onto components that were previously impossible to fit. After cooling naturally, the flywheel housing shrinks, tightly conforming to the fitted component. Therefore, setting the rounding radius R slightly smaller than the target radius R0 further enhances the connection strength between the final flywheel housing and the fitted component during use, improving the performance.

[0030] Furthermore, the difference between the radius of the flywheel housing plate 1 after rolling and the target radius of the flywheel housing is calculated and determined by the target radius, thickness, and material properties of the flywheel housing. Different flywheel housing radii, thicknesses, and materials (mainly different internal structures of different metals) will produce different deformation values ​​after rolling and heat fitting. In actual production, a corresponding mathematical model can be established for simulation calculations. Establishing a mathematical model is a relatively mature approach in the mechanical manufacturing field; therefore, relevant solutions in existing technologies can be referenced, and will not be elaborated upon here.

[0031] It should be noted that the rolling machine and welding-related tooling mentioned in the method provided by this invention are all common equipment in the field. This application aims to provide a method for processing the flywheel housing using these devices, without specifically limiting these devices. In actual use, other rolling equipment besides the rolling machine can also be used to roll the sheet 1 of the flywheel housing, as long as it can meet the usage process and requirements of the method described in this invention. It will not be elaborated here.

[0032] The following provides a flowchart of the method provided by this invention in a specific implementation: Measuring plate thickness and machining: The thickness of plate 1 of the flywheel housing is measured using a micrometer. Plate 1 of the flywheel housing is milled on a boring machine. After milling, the length and width of plate 1 of the flywheel housing are measured under clamping condition. Rough rolling: After deburring and cleaning the sheet metal 1 of the flywheel housing, rough rolling is performed in preparation for welding. Before rough rolling, in order to accurately control the position of the rough rolling circle, and thus accurately control the shape of the flywheel housing after rough rolling, nine equal division lines are marked on the length direction of the sheet metal 1 of the flywheel housing with a marker to divide the sheet metal 1 of the flywheel housing into ten equal parts. The nine equal division lines are a to i. The sheet metal 1 of the flywheel housing is rough rolled into a "waist hole shape", which can reduce the height of the flywheel housing in the welding clamping state and avoid the clamping of the sheet metal 1 of the flywheel housing due to height limitation. It can also avoid the flywheel housing from forming a small radius bend 15. First, the plate rolling machine consists of an upper clamping roller 21, a lower clamping roller 22, a front roller 31, and a rear roller 32. One end of the sheet metal 1 is inserted between the upper clamping roller 21 and the lower clamping roller 22 of the plate rolling machine, so that the front straight edge 11 of the sheet metal 1 of the flywheel housing is close and aligned with the front roller 31, and the lower clamping roller 22 rises to clamp the sheet metal 1 of the flywheel housing. Lower the front roller 31 and raise the rear roller 32 to be horizontal with the lower clamping roller 22 and in contact with the flywheel housing to support the flywheel housing. Rotate the upper clamping roller 21 and the lower clamping roller 22 to move the flywheel housing forward until the flywheel housing moves forward to the position where the upper clamping roller 21 and the lower clamping roller 22 clamp it at the first bisector a. Then, the front half of the plate 1 is roughly rolled; that is, the upper clamping roller 21 and the lower clamping roller 22 rotate to make the plate 1 move forward. During this process, the front roller 31 is slowly and gradually raised to a suitable position to roughly roll the plate 1 until the plate 1 moves forward to the position where the upper clamping roller 21 and the lower clamping roller 22 are clamped at the fourth bisector d. Keeping the position of the front roller 31 unchanged, the upper clamping roller 21 and the lower clamping roller 22 rotate to make the plate 1 move backward and forward multiple times to roll the area between the first bisector a and the fourth bisector d until the front roller 31 is lowered to be horizontal with the lower clamping roller 22. When the upper clamping roller 21 and the lower clamping roller 22 rotate to make the plate 1 move forward to the position where the upper clamping roller 21 and the lower clamping roller 22 are clamped at the position of the fifth bisector e, the front straight edge 11 of the plate 1 is horizontal and the front edge of the front straight edge 11 is on the same vertical line as the fifth bisector e of the plate 1. If the front straight edge 11 is not horizontal or the front edge of the front straight edge 11 is not roughly on the same vertical line as the fifth bisector e of the flywheel housing, the position of the front roller 31 needs to be redefined to roughly roll the plate 1. Then, the rear half of the plate 1 is roughly rolled, i.e., keeping the front roller 31 and rear roller 32 in a falling state and horizontal with the lower clamping roller 22, the upper clamping roller 21 and lower clamping roller 22 are rotated to advance the plate 1 to the sixth bisector f. As the plate 1 continues to advance, the rear roller 32 is slowly and gradually raised to a suitable position to roughly roll the rear half of the plate 1 until the plate 1 advances to the position i where the upper clamping roller 21 and lower clamping roller 22 clamp it. Keeping the position of the rear roller 32 unchanged, the upper clamping roller 21 and lower clamping roller 22 are rotated to roll the plate 1 forward and backward multiple times in the area between the sixth bisector f and the ninth bisector i.Until the rear roller 32 is lowered to be horizontal with the lower clamping roller 22, and the upper and lower clamping rollers 21 and 22 rotate to advance the flywheel housing to the position where the upper and lower clamping rollers 21 and 22 clamp at the fifth bisector e, the rear straight edge 12 of the plate 1 is horizontal and its rear edge is on the same vertical line as the fifth bisector e of the flywheel housing. If the rear straight edge 12 is not horizontal or its rear edge is not on the same vertical line as the fifth bisector e of the flywheel housing, the position of the rear roller 32 needs to be redefined to roughly roll the rear half of the plate 1. Finally, the lower clamping roller 22 is lowered to release the plate 1. The operation of slowly and gradually raising the front roller 31 or the rear roller 32 needs to be performed during the forward or backward movement of the plate 1, because if the front roller 31 or the rear roller 32 is raised while stationary, or if the speed of raising the front roller 31 or the rear roller 32 is too fast, it is easy to cause a small bend 15 in the plate 1. Slowly and gradually raise the front roller 31 or rear roller 32 to a suitable position to roughly round the plate 1. This suitable position involves raising the front roller 31 or rear roller 32 from low to high to roughly round the plate 1 until the front straight edge 11 or rear straight edge 12 of the plate 1 is horizontal, and the front or rear edge of the plate 1 is on the same vertical line as the fifth bisector e of the flywheel housing. Record this suitable position. Subsequently raising the front roller 31 or rear roller 32 directly to this position can improve the rounding efficiency of the plate 1. Simultaneously, the horizontal and opposite front straight edges 11 and 12 of the plate 1 facilitate clamping during the welding process and help to subsequently finely round the flywheel housing at the weld 13 position into an ideal circle. Welding: The flywheel housing is placed horizontally on the welding support column 41 and the combined pressure plate 42 is used to press and fix the flywheel housing onto the welding support column 41. By adjusting the height of the support part 43, the front straight edge 11 and the rear straight edge 12 are made horizontal, and the weld 13 of the plate 1 is welded. The front straight edge 11 and the rear straight edge 12 are retained at both ends of the plate 1. This makes the plate 1 more secure when clamped on the welding support column 41 using the combined pressure plate 42, avoiding the situation of welding shrinkage and movement of the plate 1 during the welding process, and ensuring the welding quality of the weld. Fine rolling: Place the welded flywheel housing on the plate rolling machine, position the weld seam 13 of plate 1 directly above the front roller 31, ensuring that plate 1 is aligned with the front roller 31. Raise the lower clamping roller 22 to clamp plate 1, causing the upper and lower clamping rollers 21 and 22 to rotate and roll plate 1 forward. As plate 1 continues to move forward, slowly and gradually raise the front roller 31 and rear roller 32 to a suitable position to perform fine rolling of plate 1. At this time, the height of the front roller 31 and rear roller 32 should be higher than that of the front roller 31 and rear roller 32 during rough rolling. The rolling radius formed by fine rolling of plate 1 is smaller than that formed by rough rolling, and smaller than the required radius R0 of plate 1. During fine rolling, the front roller 31 and rear roller 32... The position should be higher than the lifting height of the front roller 31 and the rear roller 32 during the rough rounding process. During the fine rounding, the front roller 31 and the rear roller 32 exert a greater force on the plate 1. The rounding radius formed by the plate 1 during the fine rounding is smaller than that formed by the plate 1 during the rough rounding. Theoretically, the flywheel shell will form a circle with a radius of R after fine rounding. However, because it is smaller than the radius R0 required by the flywheel shell, the round flywheel shell will form an ideal circle with a radius of R0 under the action of tension. This improves the roundness of the flywheel shell during fine rounding and ensures the success rate of the flywheel shell being heat-fitted onto the flywheel retaining ring. During the rolling process of the plate 1, the oscillation of the plate 1 is visually checked. When the plate 1 almost stops oscillating, it means that the plate 1 has been rounded. As the upper clamping roller 21 and the lower clamping roller 22 rotate to make the flywheel housing roll forward, you can place your hand at the force application point 14 to apply a radial force to the plate 1, so that the plate 1 forms a reverse arc. This arc can fully straighten the plate 1 before it enters the rolling process, and can eliminate the small bend 15 caused by the excessive speed of the front roller 31 or the rear roller 32. Continue to roll the plate 1, and gradually lower the front roller 31 and the rear roller 32 until they are horizontal with the lower clamping roller 22. Finally, lower the lower clamping roller 22 to release the flywheel housing. Dimensional inspection: Measure the outer diameter of the flywheel housing with a π ruler, and subtract twice the thickness of the flywheel housing sheet material to obtain the inner diameter of the flywheel housing. The inner diameter of the flywheel housing should meet the technical requirements of the drawing. Cleaning and Packaging: Clean the flywheel housing with a white cloth dampened with alcohol, and then wrap and protect the flywheel housing with plastic sheeting.

[0033] The flywheel housing prepared by the method provided in this invention has higher dimensional accuracy and can better meet subsequent usage requirements. The overall equipment and operation process are simpler, especially the welding process is more convenient, thus reducing production costs.

[0034] The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this application; at the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this application. Therefore, the content of this specification should not be construed as a limitation of this application.

[0035] Certain terms are used in the specification and claims to refer to specific components. Those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This specification and claims do not distinguish components based on differences in name, but rather on differences in function. The terms "comprising" and "including" used throughout the specification and claims are open-ended and should be interpreted as "comprising / including but not limited to". "Approximately" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain margin of error. The following descriptions in the specification describe preferred embodiments of this application; however, these descriptions are intended to illustrate the general principles of this application. Although the invention has been described in detail with reference to embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of this invention do not depart from the spirit and scope of the invention and should be covered by the claims.

Claims

1. A method for manufacturing a large shielded motor flywheel housing, characterized in that, include: S1. Prepare sheet metal for manufacturing the flywheel housing; S2. The board is rough rolled to form a waist-shaped hole, and straight edges are reserved at both ends of the board. The straight edges at both ends of the board are discontinuous at one waist of the waist-shaped hole, and the ends of the straight edges at both ends of the board are close to each other. S3. Butt weld the ends of the two straight edges reserved on the plate. S4. The sheet metal is precision rolled to form a cylindrical flywheel housing.

2. The method for manufacturing a large shielded motor flywheel housing according to claim 1, characterized in that, In S1, milling is used to manufacture the sheet metal.

3. The method for manufacturing a large shielded motor flywheel housing according to claim 1, characterized in that, In S2, the plate is rough rolled by a plate rolling machine, which includes clamping rollers, a front roller, and a rear roller. The clamping rollers include an upper clamping roller and a lower clamping roller. The plate is clamped and conveyed based on the rotation of the upper clamping roller and the lower clamping roller. The front roller and the rear roller are respectively located on both sides of the clamping roller along the direction of plate movement. The front roller and the rear roller are respectively used to cooperate with the clamping roller to roll the front and rear parts of the plate into two rounded edges in the shape of a waist hole.

4. The method for manufacturing a large shielded motor flywheel housing according to claim 3, characterized in that, S2 includes: S21. Draw lines on the board so that the board is divided into ten equal parts along its length; S22. Insert one end of the board parallel between the clamping rollers, and align the front edge of the board with the front roller. Rotate the clamping rollers to move the board forward until the board moves to the position where the clamping rollers clamp it at the first dividing line. S23. The clamping roller rotates to advance the board to the position where the clamping roller clamps the fourth dividing line. At the same time, the front roller is gradually raised. The clamping roller rotates to make the board reciprocate. The front roller performs rough rounding on the part of the board between the first and fourth dividing lines. S24. The clamping rollers rotate to advance the board to the position where the clamping rollers clamp the board at the sixth dividing line. At the same time, the rear roller is gradually raised. The rotation of the clamping rollers causes the board to reciprocate. The rear roller performs rough rounding on the part of the board between the sixth and ninth dividing lines.

5. The method for manufacturing a large shielded motor flywheel housing according to claim 4, characterized in that, The area between the front edge of the board and the first dividing line is the front straight edge; the area between the first dividing line and the fourth dividing line is the front rounded edge; the area between the rear edge of the board and the ninth dividing line is the rear straight edge; and the area between the sixth dividing line and the ninth dividing line is the rear rounded edge. In S23, the rough rolling to the front round edge is a semi-circle. In S24, the rough rolling to the rear round edge is a semi-circle. The front straight edge and the rear straight edge of the plate form one side straight edge of the waist hole. The straight edge portion between the fourth and sixth bisectors of the plate forms the other side straight edge of the waist hole.

6. The method for manufacturing a large shielded motor flywheel housing according to claim 1, characterized in that, In step S3, the plate is supported by welding support columns, and the plate is pressed and fixed onto the welding support columns by combined pressure plates, so that the straight edges on both sides of the plate are in the same plane. Then, the straight edges on both sides of the plate are welded.

7. The method for manufacturing a large shielded motor flywheel housing according to claim 1, characterized in that, In step S4, the plate is precision rolled by a plate rolling machine. The plate is clamped by clamping rollers, which rotate to make the plate reciprocate. At the same time, the front and rear rollers are slowly lifted to precisely roll the plate into a flywheel shell.

8. The method for manufacturing a large shielded motor flywheel housing according to claim 7, characterized in that, In S4, during the fine rolling process of the sheet material, the sheet material is clamped by clamping rollers and an external radial force is applied to the sheet material to form a reverse arc. During the fine rolling process, the sheet material is continuously rolled until the sheet material no longer oscillates when subjected to rolling.

9. The method for manufacturing a large shielded motor flywheel housing according to claim 7, characterized in that, In step S4, the radius of the rounding formed by the precision rounding of the sheet metal is smaller than the target radius of the flywheel housing.

10. The method for manufacturing a large shielded motor flywheel housing according to claim 9, characterized in that, The difference between the rounding radius and the target radius is calculated and determined by the target radius of the flywheel housing, the thickness of the flywheel housing, and the material properties of the flywheel housing.

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