Method and device for stamping and forming flat motor shell

Abstract

The invention discloses a method and a device for stamping and forming a flat motor shell, the method comprises 14 stations which are sequentially arranged from material sheet entering to finished product outputting, and sheet materials are sequentially conveyed to each station for deep drawing, forming, shaping, trimming and punching operation. According to the method, the complex deep drawing process is divided into seven scientific and progressive working steps, a mold in a specific shape is matched for each step, stable flowing of materials is effectively guided, and the industrial problems that in the deep drawing process, a high-depth motor shell in an irregular shape is prone to being cracked and wrinkled, and the wall thickness is uneven are fundamentally solved.

Description

Technical Field

[0001] This invention belongs to the field of flat motor housing technology, and specifically discloses a method and apparatus for stamping flat motor housings. Background Technology

[0002] Existing technologies for manufacturing flat motor housings using stamping processes face a series of significant technical bottlenecks and inherent limitations, which severely restrict product quality, production efficiency, and manufacturing costs.

[0003] First, existing technologies are unable to meet the challenges of deep drawing. Flat motor housings have a large depth, and during the deep drawing process, the material will be subjected to great stress, which is very easy to cause serious defects such as tearing and breakage due to uneven stress distribution or exceeding the forming limit of the material. [1][2] At the same time, the irregular flat shape of the product exacerbates this problem, causing uneven material flow in the mold. Local areas may become too thin due to excessive stretching, or wrinkles may occur due to material accumulation. This not only affects the dimensional accuracy of the product, but in more serious cases, it may directly lead to the scrapping of the product.

[0004] Secondly, existing technologies lack sufficient process adaptability and precision control capabilities. To ensure the final performance of the motor, the internal dimensions of the motor housing, the position of the small holes, and the uniformity of the wall thickness must be precisely controlled. However, traditional decentralized processes or simple multi-station stamping lines struggle to break down the process steps into finer details when dealing with complex shapes. This makes adjusting and controlling critical dimensions extremely difficult, and the consistency and stability of product quality are hard to guarantee.

[0005] Furthermore, existing technologies are inadequate in terms of production flexibility and cost control. On the one hand, overcoming forming difficulties often requires investment in expensive specialized stamping equipment (such as specialized punch presses with multiple air cushions), increasing the equipment investment burden for enterprises. On the other hand, for serialized products like motor housings, switching between different specifications often requires replacing the entire set of molds, resulting in high mold development costs and long mold changeover times. This severely impacts the ability to respond quickly to market demands and prevents flexible and low-cost rapid development.

[0006] In summary, existing stamping technologies generally suffer from numerous drawbacks when manufacturing flat motor housings with high depth and irregular shapes, such as easy cracking, numerous forming defects, difficulty in guaranteeing critical dimensions, large equipment investment, and inability to adapt to the rapid development of multi-specification products. A new process method is urgently needed to systematically solve these problems. Summary of the Invention

[0007] The purpose of this invention is to overcome the aforementioned shortcomings of the prior art and provide a method and dedicated device for stamping flat motor housings. This method aims to solve the quality problems in the prior art, such as easy cracking during deep drawing, localized scratches, and thinning of material thickness, caused by the large depth and irregular shape of the motor housing; it also addresses the technical bottlenecks of difficulty in controlling the accuracy of key dimensions, reliance on specialized and expensive equipment, and inability to quickly adapt to the development of multi-specification series products.

[0008] To achieve the above objectives, according to the technical solution provided by the present invention, a method for stamping a flat motor housing is provided, characterized by comprising 14 stations arranged sequentially from the entry of the sheet material to the output of the finished product. The sheet material is sequentially conveyed to each station for deep drawing, forming, shaping, trimming, and punching operations. The specific steps are as follows: Station 1, Deep drawing: The sheet material is pre-drawn for the magnet position using a punch with a large arc-shaped top; Station 2, Deep drawing: The workpiece is pre-drawn for the magnet position using a punch with a large conical top; Station 3, Deep drawing: The workpiece is pre-drawn for the magnet position using a punch with a large arc-shaped top; Station 4, Deep drawing: Under the condition that the shape of the magnet position remains unchanged, the initial pre-drawing of the small convex bulge at the head of the motor housing is performed. Station 5, Deep Drawing: While maintaining the shape of the magnetic cylinder position, reduce the diameter of the small convex bump; Station 6, Deep Drawing: Deep draw to form the small convex bump step at the head, and locally compress the top of the magnetic cylinder position; Station 7, Deep Drawing: Deep draw the magnetic steel position from a circle to a square, and shape its inner diameter to the finished size; Station 8, Forming: Flatten the flange surface, and simultaneously deep draw the head bearing position; Station 9, Forming: Punch a waterproof groove on the flange surface, and flatten the flange surface to the finished height size; Station 10, Forming: Punch out the top protrusion; Station 11, Shaping: Shape the bearing position to the finished size; Station 12, Trimming: Trim the flange surface; Station 13, Punching: Punch holes at the designated positions; Station 14, Emptying.

[0009] Preferably, according to the method of claim 1, the drawing coefficient of the first station is 0.58; the drawing coefficient of the second station is 0.84; and the drawing coefficient of the third station is 0.85.

[0010] Preferably, the flange surface formed at the 9th station is established as the height reference for subsequent steps.

[0011] Preferably, the punching station of the 13th station is located after all forming and the 8th to 11th stations.

[0012] Preferably, each of the 9th to 11th workstations is responsible for forming or shaping only one feature on the product.

[0013] Preferably, the stamping process employs an automated stamping production line, which includes an open punch press for blanking and a double-point closed punch press for performing the 14-station stamping operations, and a three-dimensional robotic arm automatically transports the workpiece between the stations of the double-point closed punch press.

[0014] Preferably, the process also includes a step of lubricating the workpiece at the deep drawing station, wherein lubricating oil is automatically injected into the upper die cavity through an oil pipe, and grooves and holes for recovering lubricating oil are provided at the bottom of the die frame.

[0015] This invention also discloses an apparatus for stamping flat motor housings, characterized in that it comprises: a plurality of stamping dies arranged in sequence for performing the operations described in claim 1, wherein the plurality of stamping dies comprises at least: a first drawing die, the top of which is a large arc approximately spherical; a second drawing die, the top of which is a large conical shape; a third drawing die, the top of which is a large arc shape; a fourth drawing die, used for pre-drawing at the head of the workpiece to form an initial small bulge; a fifth drawing die, used for reducing the diameter of the small bulge; a sixth drawing die, used for drawing to form a step of the small bulge at the head and locally compressing the top of the magnet position; a seventh drawing die, used for drawing the magnet position from a circle to a square; a flange flattening forming die; a waterproof groove forming die; a convex point forming die; a bearing position shaping die; a trimming die; a punching die; and a workpiece conveying device for conveying workpieces between the plurality of stamping dies.

[0016] Preferably, the device further includes a lubrication system, which includes a lubricating oil injection hole disposed at the upper die cavity of the drawing die, and a groove and a recovery hole disposed at the bottom of the die frame for recovering lubricating oil.

[0017] Preferably, the plurality of stamping dies are installed in a double-point closed-type punch press, and the workpiece conveying device is a three-dimensional robot; the drawing die and the forming die both adopt a replaceable core structure to adapt to the production of motor housings of different specifications.

[0018] The beneficial effects of this invention are as follows: Compared with the prior art, this invention achieves a breakthrough improvement in product quality, production cost, and manufacturing flexibility through its ingenious process steps and innovative device design, bringing significant comprehensive benefits. Firstly, by breaking down the complex deep-drawing process into seven scientific and progressive steps, and matching each step with a mold of a specific shape, this invention effectively guides the smooth flow of material, fundamentally solving the industry problems of easy cracking, wrinkling, and uneven wall thickness in high-depth, irregularly shaped motor housings during deep drawing. Simultaneously, through a series of unique process arrangements such as "one feature per station," establishing a unified height benchmark, and placing the punching station post-processing, it ensures high precision and stability of key dimensions such as the motor housing's internal cavity, height, and hole positions, thereby significantly improving the overall product quality and yield. Furthermore, this invention also brings considerable economic benefits. Since this process can operate stably on a general-purpose closed-loop punch press, enterprises do not need to invest in expensive dedicated punch presses, significantly reducing equipment investment. The automatic lubricating oil circulation system also effectively saves operating costs. More importantly, the interchangeable core design of the mold gives the production line extremely high flexibility, allowing it to quickly switch to produce different specifications of products by changing a few core components. This not only significantly reduces the mold development costs for new products but also shortens the development cycle, providing strong technical support for enterprises to respond quickly to market changes. In summary, the combination of this simplified mold structure and automated conveying makes process debugging and equipment maintenance simple and quick, ensuring that the entire production line can achieve long-term, efficient, and stable automated production. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments disclosed in this invention, the accompanying drawings of the embodiments will be briefly described below. These drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention.

[0020] Figure 1 This is a schematic diagram of the overall layout of an automated stamping production line for a method of stamping and forming a flat motor housing according to the present invention.

[0021] Figure 2 This is a front view of the multi-station stamping die used in this invention, showing the workpiece forming process from station 1 to station 14.

[0022] Figure 3 This is a top view of the multi-station stamping die used in this invention.

[0023] Figure 4 This is a schematic diagram showing the layout of the lubricating oil injection hole and recovery hole of the multi-station stamping die used in this invention.

[0024] In the diagram: A - Uncoiling feeder; B - 80T punch press; C - Magnetic belt conveyor; D - 400T punch press; E - 3D robotic arm; F - Belt conveyor. Detailed Implementation

[0025] The technical solutions (including preferred technical solutions) of the present invention will be further described in detail below with reference to the accompanying drawings and by way of listing some optional embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0026] To make the technical solution, implementation process, and expected technical effects of the present invention clearer and more complete, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, it should be clear that the following embodiments are intended to illustrate the core technology of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, based on the technical content disclosed in these embodiments, any modifications, equivalent substitutions, or improvements made by those skilled in the art without departing from the core idea of ​​the present invention should be considered to be included within the scope of protection of the present invention.

[0027] First, regarding the composition and collaborative working principle of automated stamping production systems, please refer to [link to relevant documentation]. Figure 1This embodiment provides an automated production system for stamping flat motor housings. It is a highly integrated system combining mechanical, electrical, hydraulic, and control technologies, with the fundamental design goal of achieving fully automated, high-precision, and high-efficiency production from raw material coils to finished parts. Specifically, the system's workflow begins with the uncoiling and feeding unit, which serves as the material source. The core function of this unit is to unwind, level, and supply the coil to be processed (typically cold-rolled low-carbon steel coils of grade DC04) to the subsequent blanking press in a controlled manner. To achieve this, this embodiment employs a heavy-duty hydraulic automatic uncoiling machine. This uncoiling machine, through its hydraulically driven expandable mandrel and pressure arm, ensures reliable clamping and smooth uncoiling of steel coils of different specifications. Furthermore, it is equipped with an advanced material arc control system. This system utilizes non-contact sensors to monitor the material arc height between the uncoiling machine and the leveling feeder in real time, and dynamically adjusts the uncoiling machine's speed through closed-loop control. This decouples the speed difference between the two devices while ensuring that the subsequent precision leveling feeder can always pull the steel strip with minimal resistance. Furthermore, the precision leveling and feeding machine integrates both leveling and feeding functions. On the one hand, its leveling part uses multiple pairs of staggered rollers to repeatedly bend and deform the steel strip to eliminate internal stress and plate shape defects. On the other hand, its feeding part uses a high-precision servo motor to control the feeding length of each feeding with an accuracy of up to 0.01mm according to the instructions of the punch press's main PLC, providing high-quality flat raw materials for subsequent processes.

[0028] Subsequently, the precisely fed strip enters an 80T open-type punch press specifically designed for the blanking process. The blanking process is separated from the main forming punch press based on multiple technical considerations: firstly, to achieve vibration isolation, physically separating the significant impact of blanking from the precision drawing process requiring extremely high stability, thus ensuring the dynamic stability of the main forming process; secondly, to optimize equipment efficiency, avoiding energy waste caused by using a large-tonnage punch press to perform small-tonnage tasks; and thirdly, to improve the convenience of die maintenance, allowing for quick replacement of rapidly worn blanking dies without affecting the complex main die. At this station, a set of standard blanking dies cuts the strip into individual circular sheets, with precise die clearance ensuring excellent sheet cross-sectional quality.

[0029] After the blanking process is completed, the dropped circular sheet material falls onto a magnetic belt conveyor. This type of conveyor is chosen because its built-in magnet array can reliably attract the steel sheet material, preventing slippage even when the surface is coated with lubricating oil. This ensures that the sheet material is transported stably and orderly, and is precisely positioned at the end by mechanical stops and sensors, preparing it for subsequent gripping by a three-dimensional robotic arm.

[0030] Next, the sheet metal is fed into the main equipment performing the core forming task—a 400T double-point closed-type punch press. The selection and structure of this punch press play a decisive role in the final product quality. Its enclosed body structure and double-crankshaft drive design not only provide extremely high overall rigidity to resist enormous punching force and ensure ultra-high precision of the slide movement, but also effectively resist eccentric loads, providing uniform and vertical pressure to all stations of the large multi-station mold. Simultaneously, its precise slide guiding system further ensures the high accuracy and repeatability of the motion trajectory. Inside this punch press, the core of automatic workpiece transfer is a three-dimensional robotic arm transfer system. This system consists of servo-driven X, Y, and Z motion axes, whose motion trajectory is programmed as an electronic cam curve that strictly corresponds to the angle of the punch press slide. It can quickly and accurately complete the synchronous transfer of all workpieces between stations the instant the mold opens, and sensors on the grippers ensure the safety and reliability of the transfer process. Finally, after the workpiece is processed at the last effective station, it is picked up by the robot in the next cycle and placed on the finished product output conveyor outside the mold area, thus completing the entire automated production process.

[0031] Secondly, for a detailed technical analysis of the 14-station progressive die, please refer to [link / reference needed]. Figure 2The multi-station die installed within the 400T press breaks down the entire forming process into three logically distinct stages. The first stage, stations 1 to 7, is the main deep drawing stage, aiming to transform a flat, circular sheet into a three-dimensional shell with a square body and complex top features. Given that this process involves the most intense plastic deformation of the material, this invention employs a gradual approach. Specifically, stations 1 to 3 focus on the three-stage pre-drawing of the magnet position, aiming to make the material deformation process smooth and controllable by decomposing the total drawing ratio into three smaller, reasonable drawing coefficients. In this process, station 1-1 serves as the initial pre-drawing stage. The top of the punch is designed as a large-radius arc, approximating a sphere, with a drawing factor of 0.58. This aims to gently break the planar state of the material and form a uniform initial profile. Subsequently, in station 1-2, the top of the punch changes to a large-angle conical surface, with a drawing factor of 0.84, effectively increasing the drawing depth of the workpiece. Furthermore, in station 1-3, the top of the punch returns to a large arc shape, with a drawing factor of 0.85. The purpose is not simply to pursue depth, but to correct and homogenize any minor shape deviations and uneven stresses that may have occurred in the first two steps, thus providing a high-quality semi-finished product for subsequent forming. Building upon this foundation, stations 4 to 6 focus on the fine forming of the small top protrusion. Because this feature is small in size and has a small radius of curvature, it involves localized limit forming and is therefore addressed using a step-by-step method. Station 4-1 first uses a large-diameter, rounded-head punch to pre-draw a shallow and large initial bulge. Then, station 4-2 uses a smaller-diameter punch for further drawing, utilizing the plastic flow of the material to reduce the bulge diameter while increasing its height, cleverly avoiding excessive thinning of the top material. Crucially, in station 4-3, in addition to drawing the final stepped geometry of the small bulge, a ring-shaped embossing boss is designed around the upper die to apply extremely high local pressure to the annular area outside the root of the small bulge and the top of the workpiece. This local compression, similar to cold forging, aims to preemptively eliminate the slight wrinkling tendency caused by material accumulation in this area, clearing obstacles for the subsequent intense deformation. Finally, at station 7, the end of the drawing stage, a square-section punch pushes the fully prepared circular cylindrical workpiece into the square die cavity, completing the round-to-square drawing process. In this step, the internal cavity dimensions of the workpiece are precisely determined, meeting the requirements of the final product.

[0032] The second stage, consisting of fine forming and shaping at stations 8 to 11, follows immediately. In this stage, with the main shape of the workpiece complete, the task shifts to machining secondary features such as flanges, holes, and grooves, and performing final dimensional calibration on areas requiring high precision. For example, station 8 flattens the flange surfaces around the workpiece for the first time, while simultaneously performing final deep drawing or stamping on the bearing mounting position at the head. Next, at station 9, the annular rib of the upper die stamps a waterproof groove on the flange surface for installing the sealing ring. More importantly, the upper die platen at this station flattens the flange surface of the workpiece to the precise height required by the finished drawing, establishing it as the "height reference plane" for the entire workpiece, thus fundamentally eliminating the problem of inconsistent overall height dimensions caused by accumulated errors from multiple stations. Afterwards, station 10 is a relatively simple forming step, used to stamp four recesses or bosses on the top of the motor housing for positioning or reinforcement structures. The 11th station is a high-precision bearing seat sizing station. Its ultra-precision mold applies an extremely high unit pressure to the already formed bearing seat hole wall. The aim is to eliminate the elastic recovery of the material through a small amount of plastic deformation, thereby accurately fixing the hole diameter to the target size, while improving dimensional accuracy, improving surface finish and producing work hardening.

[0033] Finally, the third stage, consisting of stations 12 to 14, involves final finishing and auxiliary work. Station 12 uses a precision trimming die to cleanly and efficiently remove excess, irregular process allowances (material edges) from the flange's outer edge. Station 13 performs the punching process. Placing this step after all forming and shaping processes is a crucial decision, as punching after the workpiece's main shape and dimensions have fully solidified and internal stresses have been largely released ensures the most precise control over the hole's shape, size, and relative position. Station 14 is a station without any processing; its design allows for flexibility in future product design changes or process optimizations, and facilitates routine mold maintenance and adjustments.

[0034] In summary, this invention comprises four stages: The first stage, namely stations 1 to 7, is the main deep drawing stage, aiming to transform the planar circular sheet into a three-dimensional shell with a square body and complex top features. As a specific implementation of the first three drawing steps in claim 1, this embodiment performs three consecutive pre-drawing operations at the magnetic steel position on the sheet. At station 1, the first drawing die as described in claim 8 is configured, characterized in that its punch top is a large arc approximately spherical shape, and initial pre-drawing is performed with a drawing coefficient of 0.58; at station 2, the second drawing die takes over, characterized in that its punch top is a large conical shape, and secondary drawing is performed with a drawing coefficient of 0.84; finally, at station 3, the third drawing die completes the process, characterized in that its punch top returns to a large arc shape, and tertiary drawing is performed with a drawing coefficient of 0.85. This technique of achieving deep drawing step-by-step by changing the geometry of the punch top and matching a specific drawing coefficient (corresponding to claim 2) effectively guides the plastic flow of the material and avoids stress concentration. Building upon this foundation, stations 4 through 6 focus on the precise shaping of the small top bulge. The corresponding fourth, fifth, and sixth drawing dies respectively achieve the initial pre-drawing, diameter reduction and height increase of the small bulge, and the final step forming and crucial local compression. Particularly important is the sixth station, where an annular embossing boss is designed around the upper die to apply extremely high local pressure to the annular area on the top of the workpiece body and the outer edge of the small bulge root. This local compression, similar to cold forging, aims to preemptively eliminate the slight wrinkling tendency caused by material accumulation in this area, clearing obstacles for the subsequent intense deformation. Finally, at the seventh station, the seventh drawing die—a square-section punch and die—pushes in the fully prepared cylindrical workpiece, completing the round-to-square deep drawing. In this step, the internal cavity dimensions of the workpiece are precisely determined, meeting the requirements of the final product.

[0035] The second stage, namely the fine forming and shaping at stations 8 to 11, involves machining secondary features and calibrating critical dimensions. For example, at station 8, a flange flattening die flattens the flange surfaces around the workpiece for the first time, while simultaneously performing final deep drawing or stamping on the bearing mounting position at the head. Next, at station 9, a waterproof groove forming die, under the action of the annular ribs on the upper die, stamps a waterproof groove on the flange surface for installing the sealing ring; more importantly, the upper die platen at this station flattens the flange surface of the workpiece to the precise height dimension required by the finished drawing, establishing it as the "height reference surface" for the entire workpiece, which constitutes a direct realization of the technical feature described in claim 3. Afterwards, the protrusion forming die at station 10 is a relatively simple forming step, used to stamp four recesses or bosses on the top of the motor housing for positioning or reinforcement structures. The bearing seat shaping mold at station 11 is a high-precision sizing station. Its ultra-precision machined mold applies extremely high unit pressure to the already formed bearing seat hole wall, aiming to eliminate the elastic recovery of the material through minute plastic deformation, thereby precisely fixing the hole diameter to the target size, while simultaneously improving dimensional accuracy, surface finish, and inducing work hardening. This stage of the design perfectly embodies the technical solution described in claim 5, where each of stations 9 to 11 is responsible for forming or shaping only one feature on the product.

[0036] Finally, the third stage, consisting of stations 12 to 14, involves final finishing and auxiliary work. Station 12 uses a precision trimming die to cleanly and efficiently remove excess, irregular process allowances (material edges) from the flange's outer edge. Station 13 performs the punching process using a punching die. Placing this process after all forming and shaping processes is a concrete implementation of a technical decision. Punching after the workpiece's main shape and dimensions have been fully solidified and internal stresses have been largely released ensures the most precise guarantee of the hole's shape, size, and relative position. Station 14 is an empty station, designed to provide flexibility for future product design changes or process optimizations.

[0037] In addition, to support the stable operation of the entire complex process, this invention also includes two important auxiliary technology systems. The first is an automated lubrication and circulation recovery system; please refer to [link to relevant documentation]. Figure 4The first system features precise lubricating oil injection holes at key locations on the upper die of the deep drawing station, linked with a PLC to achieve programmed lubrication on demand, at specific points, and in precise quantities. Simultaneously, excess lubricating oil is collected through guide grooves and recovery holes designed on the lower die holder, and then recycled after centralized filtration and regeneration, balancing lubrication effectiveness with environmental costs. The second system utilizes a modular design for rapid die replacement core units in flexible production. This design divides the entire die set into two main parts: a universal die frame and dedicated, replaceable forming core units. When switching to produce different specifications, operators only need to replace the standardized core modules, without replacing the entire die frame. This reduces die changeover time from several hours to tens of minutes, significantly improving the overall equipment efficiency of the production line and reducing the die development costs for introducing new products.

[0038] In summary, this invention provides a complete technical solution for the high-quality, high-efficiency, low-cost, and flexible production of flat motor housings by systematically integrating automated production lines, deeply deconstructing and refining the stamping process, and supplementing it with advanced lubrication and mold technologies. While the above description is detailed, it is only a preferred embodiment of the invention, and the design concepts and technical principles embodied therein have general guiding significance for those skilled in the art.

[0039] It will be readily understood by those skilled in the art that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, combinations, substitutions, improvements, etc., made under the spirit and principles of the present invention are included within the protection scope of the present invention.

Claims

1. A method of press forming a flat motor case, characterized by, The 14 stations are arranged in sequence from the material sheet entering to the finished product output, and the sheet material is sequentially conveyed to each station for deep drawing, forming, shaping, trimming and punching operations, and the steps are as follows: the first station, deep drawing: using a convex die with a large circular arc approximate spherical top to perform the first pre-drawing of the magnetic steel position; the second station, deep drawing: using a convex die with a large conical surface shape top to perform the second pre-drawing of the magnetic steel position; the third station, deep drawing: using a convex die with a large circular arc shape top to perform the third pre-drawing of the magnetic steel position; the fourth station, deep drawing: under the condition that the shape of the magnetic cylinder position remains unchanged, the initial pre-drawing of the small convex bump on the head of the motor shell is performed; the fifth station, deep drawing: under the condition that the shape of the magnetic cylinder position remains unchanged, the diameter of the small convex bump is reduced; the sixth station, deep drawing: the small convex bump step of the head is formed, and the top of the magnetic cylinder position is partially compressed; the seventh station, deep drawing: the magnetic steel position is deep drawn from a circular shape to a square shape, and the inner diameter is shaped to the finished product size; the eighth station, forming: the flange surface is flattened, and the bearing position of the head is deep drawn; the ninth station, forming: a waterproof groove is punched on the flange surface, and the flange surface is flattened to the finished product height size; the tenth station, forming: the convex point of the top is punched out; the eleventh station, shaping: the bearing position is shaped to the finished product size; the twelfth station, trimming: the flange surface is trimmed; the thirteenth station, punching: punching at the specified position; and the fourteenth station, empty.

2. The method of press forming a flat motor housing according to claim 1, wherein, The deep drawing coefficient of the first station is 0.58; the deep drawing coefficient of the second station is 0.84; and the deep drawing coefficient of the third station is 0.

85.

3. The method of press forming a flat motor housing according to claim 1, wherein, The flange surface formed at the ninth station is established as the height reference for the subsequent steps.

4. The method of press forming a flat motor housing according to claim 1, wherein, The punching station of the thirteenth station is arranged after all the forming stations and the eighth to eleventh stations.

5. The method of press forming a flat motor housing according to claim 1, wherein, The ninth to eleventh stations are each responsible for the forming or shaping of only one feature on the product.

6. The method of press forming a flat motor housing according to claim 1, wherein, The stamping forming adopts an automatic stamping production line, which includes an open die press for blanking and a double-point closed die press for performing the stamping operations of the 14 stations, and a three-dimensional robot is used to automatically transport the workpiece between the stations of the double-point closed die press.

7. The method of press forming a flat motor case according to any one of claims 1 to 6, characterized by, The step of lubricating the workpiece at the deep drawing station is also included, which is achieved by automatically injecting lubricating oil into the concave die of the upper die through an oil pipe, and a groove and a hole for recovering the lubricating oil are arranged at the bottom of the die holder.

8. An apparatus for press forming a flat motor case, characterized by, The step of lubricating the workpiece at the deep drawing station is also included, which is achieved by automatically injecting lubricating oil into the concave die of the upper die through an oil pipe, and a groove and a hole for recovering the lubricating oil are arranged at the bottom of the die holder. A plurality of stamping dies arranged in sequence for performing the work of each station as claimed in claim 1, the plurality of stamping dies comprising at least: a first drawing die with a punch top being approximately spherical in shape; a second drawing die with a punch top being in the shape of a large conical surface; a third drawing die with a punch top being in the shape of a large circular arc; a fourth drawing die for pre-drawing an initial small convex bump on the head of the workpiece; a fifth drawing die for reducing the diameter of the small convex bump; a sixth drawing die for drawing a small convex bump step on the head and locally compressing the top of the magnetic cylinder position; a seventh drawing die for drawing the magnetic steel position from a circle to a square; a flange surface forming die; a waterproof groove forming die; a convex point forming die; a bearing position shaping die; a trimming die; a punching die; and a workpiece conveying device for conveying the workpiece between the plurality of stamping dies.

9. The apparatus for press forming a flat motor case according to claim 8, wherein The device further comprises a lubricating system comprising lubricating oil injection holes arranged at the concave die of the drawing die, and grooves and recovery holes arranged at the bottom of the die frame for recovering the lubricating oil.

10. The apparatus for press forming a flat motor case according to claim 8 or 9, characterized in that, The plurality of stamping dies are installed in a double-point closed stamping machine, and the workpiece conveying device is a three-dimensional robot; the drawing dies and the forming dies are all of the replaceable core type to adapt to the production of motor housings of different specifications.

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