A stamping die for irregularly shaped parts and its application method

Abstract

This invention discloses a stamping die for irregularly shaped parts and its method of use, relating to the field of stamping die technology. The stamping die for irregularly shaped parts includes an upper die assembly, a lower die assembly, and a graded drive mechanism. The upper die assembly includes at least two coaxially arranged forming units, at least one of which is a cylindrical forming unit. The at least two forming units can be selectively driven to provide different working diameters. The graded drive mechanism is connected to the upper die assembly and is used to selectively drive different forming units. The lower die assembly includes a die core and at least one movable nest, which can move axially relative to the die core to change the cavity diameter of the lower die assembly, making it match the working diameter of the selected forming unit in the upper die assembly. This configuration allows for the continuous completion of multiple deep drawing processes in a single setup by dynamically changing the working diameter of the punch and the cavity diameter of the die, thereby significantly reducing the number of dies, shortening the process flow, and improving production efficiency and product precision.

Description

Technical Field

[0001] This invention belongs to the field of stamping die technology, and specifically relates to a stamping die for irregularly shaped parts and its usage method. Background Technology

[0002] Stamping is the mainstream process for manufacturing thin-walled metal parts. Based on the geometric complexity of the parts, stamped parts can be roughly divided into regular parts and irregular parts. Among them, irregular parts usually refer to those parts with complex three-dimensional features that cannot be formed in one step by simple punching or bending. Their typical characteristics include non-axisymmetry, deep drawing structure, partial flanging, bulges, etc., which puts extremely high demands on mold design and process control.

[0003] Currently, the mainstream production process for deep-drawn rotary irregular parts adopts a discrete, multi-stage stamping scheme. The specific process is as follows: First, a circular blank is blanked; then, it must be drawn multiple times in stages to reach the required depth. Each drawing requires a set of independent drawing dies with progressively decreasing diameters and fixed working surfaces.

[0004] The drawbacks of this traditional technical approach include: 1. A large number of molds and high maintenance costs. Each deep drawing process requires a separate mold, resulting in a complex mold system structure, long manufacturing cycle, and high total cost; 2. A lengthy and inefficient production process. Parts need to be transferred between multiple presses and multiple workstations, resulting in a slow production cycle and a large footprint.

[0005] Therefore, a stamping die for irregularly shaped parts is needed. Summary of the Invention

[0006] The purpose of this invention is to provide a stamping die for irregularly shaped parts and its method of use. This die can continuously complete multiple deep drawing processes in a single setup by dynamically changing the working diameter of the punch and the diameter of the die cavity, thereby significantly reducing the number of dies, shortening the process flow, and improving production efficiency and product precision. The specific technical solution is as follows:

[0007] On one hand, the present invention provides a stamping die for irregularly shaped parts, the stamping die for irregularly shaped parts comprising an upper die assembly, a lower die assembly, and a graded drive mechanism; the upper die assembly comprises at least two coaxially arranged forming units, at least one of which is a cylindrical forming unit, the at least two forming units being selectively driven to provide different working diameters; the graded drive mechanism is connected to the upper die assembly for selectively driving different forming units; the lower die assembly comprises a die core and at least one movable nest, the movable nest being axially movable relative to the die core to change the cavity diameter of the lower die assembly to match the working diameter of the selected forming unit in the upper die assembly.

[0008] Preferably, the graded drive mechanism includes: a power rod connected to the innermost forming unit of the upper mold assembly; and a connection switching device disposed on the power rod. By controlling the working state of the connection switching device, it can selectively connect or disconnect with the forming units of different levels, thereby realizing the switching of power between the forming units.

[0009] Preferably, the connection switching device includes: a connecting sleeve, which is sleeved on the outside of the power rod and connected to the sleeve;

[0010] A locking assembly is disposed between the connecting sleeve and the power rod; a control unit is used to control the working state of the locking assembly; wherein, the control unit drives the locking assembly to switch between a locked state and a released state; in the locked state, the locking assembly fixes the connecting sleeve and the power rod, so that the power energy of the power rod is transmitted to the sleeve through the connecting sleeve; in the released state, the connecting sleeve is disconnected from the power rod.

[0011] Preferably, the at least two-stage forming unit includes a punch and at least one sleeve sleeved outside the punch; the outer side of the punch is provided with an axially extending slider, and the inner side of the sleeve is provided with an axial groove that slides with the slider.

[0012] Preferably, the connecting sleeve includes a hollow conical part and a cylindrical part, the conical part is connected to the sleeve, and the cylindrical part is provided with a connecting hole that mates with the locking assembly; the end of the power rod has a conical structure.

[0013] Preferably, the lower mold assembly further includes a concave mold cylinder, which is a fixed cylinder with openings at the top and bottom, and its inner diameter is adapted to the outer diameter of the sleeve; the upper surface of the mold core and the movable nest are both disposed inside the concave mold cylinder, and their upper surfaces together constitute the forming bottom surface of the lower mold assembly.

[0014] Preferably, the movable nesting includes an interconnected forming part and a flange, the forming part being adapted to the forming unit, and the flange being disposed on the bottom surface of the forming part.

[0015] Preferably, the flange is provided with a push rod for driving its axial movement; the concave mold cylinder is provided on the concave template, and the concave template is provided with a fixing mechanism for locking the push rod after the movable nest reaches the working position.

[0016] Preferably, the top of the push rod extends through to the end face of the flange near the concave template, and the top of the push rod is provided with a locking hole that cooperates with the fixing mechanism.

[0017] On the other hand, the present invention provides a method for multiple deep drawing of a stamping die for irregularly shaped parts, comprising the following steps:

[0018] S1: Prepare for the Nth deep drawing, where N is initially 1; control the graded drive mechanism to establish a connection between its connection switching device and the Nth level forming unit corresponding to the target diameter, so as to select the working punch diameter for this deep drawing;

[0019] S2: Control the movable nesting movement of the lower mold assembly, so that at least one movable nesting forming part rises to the working position, together with the upper surface of the mold core, to form a forming bottom surface that matches the working diameter of the Nth level forming unit, and is locked by a fixing mechanism;

[0020] S3: Place the blank between the pressure ring above the die cylinder and the lower die assembly;

[0021] S4: Perform the Nth drawing: The graded drive mechanism drives the selected Nth level forming unit downwards, cooperating with the lower die assembly to complete the Nth drawing;

[0022] S5: Determine if the final drawing is complete: If N is less than the preset total number of drawing operations M, then proceed to step S6; if N equals M, then eject the workpiece and the process ends.

[0023] S6: Prepare for the N+1th deep drawing:

[0024] S6.1: The drive unit of the graded drive mechanism drives the formed workpiece and the Nth grade forming unit back to the demolding position;

[0025] S6.2: Control the connection switching device of the graded drive mechanism to disconnect from the Nth level forming unit and establish a connection with the N+1th level forming unit with a smaller diameter;

[0026] S6.3: Control the lower mold assembly: drive the active nest that matches the diameter of the N+1th level forming unit to rise to a new working position and lock it to form a new forming bottom surface;

[0027] S7: Let N = N + 1, then return to step S4.

[0028] Compared with existing technologies, the present invention has the following advantages:

[0029] 1. The functions of traditional multiple deep drawing dies are integrated into a single die, and the variable diameter design adapts to the forming requirements of different passes, reducing manufacturing and maintenance costs.

[0030] 2. It enables the completion of all deep drawing processes with a single press and a single workpiece clamping, eliminating the time for inter-process transfer, positioning, and offline annealing, and revolutionizing production cycle time and space utilization.

[0031] 3. The workpiece is formed entirely within the mold, avoiding the cumulative errors caused by repeated positioning, and significantly improving product consistency and dimensional accuracy. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0033] Figure 1 This is a schematic diagram of the overall structure of a shaped part stamping die in one embodiment of the present invention.

[0034] Figure 2 This is an exploded view of a stamping die for irregularly shaped parts according to one embodiment of the present invention.

[0035] Figure 3 This is a schematic diagram of the first deep drawing process of a shaped part stamping die in one embodiment of the present invention.

[0036] Figure 4 This is a schematic diagram of the second stamping and drawing process of a non-standard part stamping die in one embodiment of the present invention.

[0037] Explanation of key figure labels:

[0038] 1. Forming unit; 101. Sleeve; 102. Punch; 103. Slider; 104. Slide groove; 2. Graded drive mechanism; 201. Connection switching device; 2011. Connecting sleeve; 2012. Locking assembly; 2011A. Cylindrical part; 2011B. Conical part; 202. Power rod; 203. Connecting hole; 3. Lower mold assembly; 301. Die cylinder; 302. Mold core; 303. Movable nest; 3031. Forming part; 3032. Flange; 304. Die plate; 3041. Fixing hole; 305. Push rod; 3051. Locking hole; 306. Cavity. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Next, the working principle of this embodiment will be described in detail to enable those skilled in the art to better understand the present invention:

[0041] refer to Figure 1 and Figure 2 The irregular part stamping die includes an upper die assembly, a lower die assembly 3, and a graded drive mechanism 2. The upper die assembly includes at least two coaxially arranged forming units 1, at least one of which is a cylindrical forming unit 1. The at least two forming units 1 can be selectively driven to provide different working diameters. The graded drive mechanism 2 is connected to the upper die assembly and is used to selectively drive different forming units 1. The lower die assembly 3 includes a die core 302 and at least one movable nest 303. The movable nest 303 can move axially relative to the die core 302 to change the diameter of the cavity 306 of the lower die assembly 3 so that it matches the working diameter of the selected forming unit 1 in the upper die assembly.

[0042] This invention is applied to the working scenarios of stamping and deep drawing of rotary workpieces. This embodiment is illustrated using a straight cylindrical structure. The thickness of the forming unit 1 (sleeve type 101) is set according to the specific dimensions of the workpiece requiring multiple forming operations, and the number of forming units 1 (sleeve type 101) is set according to the number of processing operations required for the final forming. The forming unit 1 (sleeve type 101) represents the gradient of the punch diameter 102. By driving the number of forming units 1 (sleeve type 101), the working diameter of the upper die assembly can be changed. Simultaneously, the die below the upper die assembly is controlled by a pre-set program to correspondingly increase or decrease the number of movable nests 303 in the lower die assembly 3, thereby changing the diameter of the cavity 306 of the lower die assembly 3 to match the working diameter of the selected forming unit 1 in the upper die assembly. This setting improves the utilization efficiency of the mold and reduces costs; furthermore, since the operation is performed on the same mold, it saves the time spent transporting the workpiece to the next process, shortening the workflow.

[0043] In this embodiment, the graded drive mechanism 2 includes: a power rod 202, which is connected to the innermost forming unit 1 of the upper mold assembly; and a connection switching device 201, which is disposed on the power rod 202. By controlling the working state of the connection switching device 201, it can selectively connect or disconnect with the forming units 1 at different levels, thereby realizing the switching of power between the forming units 1.

[0044] During the deep drawing process, the diameter of the deep drawing process gradually decreases, and in the subsequent cycle processing after the completion of the process, the innermost forming unit 1 is the working tool used in both the final deep drawing process and the initial deep drawing process. Therefore, the power rod 202 can be fixedly connected to the innermost forming unit 1. The power rod 202 can be hydraulically driven, and the power rod 202 can directly output pressure to the upper die assembly. The connection switching device 201 on the power rod 202 can distribute the pressure output of the power rod 202 to the innermost forming unit 1 and several cylindrical forming units 1. Specifically, the connection switching device 201 includes a connecting sleeve 2011, which is sleeved on the power rod 202 and connected to the sleeve 101; a locking assembly 2012, which is disposed between the connecting sleeve 2011 and the power rod 202; and a control unit, used to control the working state of the locking assembly 2012. The control unit drives the locking assembly 2012 to switch between a locked state and a released state. In the locked state, the locking assembly 2012 secures the connecting sleeve 2011 to the power rod 202, allowing the power energy of the power rod 202 to be transmitted to the sleeve 101 through the connecting sleeve 2011. In the released state, the connecting sleeve 2011 is disconnected from the power rod 202. The connecting sleeve 2011 is set according to the number of sleeves 101, with each connecting sleeve 2011 corresponding to one sleeve 101. The locking component 2012 passes through each connecting sleeve 2011. By utilizing the characteristic that the diameter gradually decreases in the deep drawing process, the control of the connecting sleeve 2011 is gradually connected or released, so as to selectively drive different forming units 1.

[0045] Specifically, the forming unit 1 may include a punch 102 and at least one sleeve 101 sleeved outside the punch 102. The punch 102 and the sleeve 101 form a solid structure with a tight structure. The graded drive mechanism 2 is connected to the punch 102 and the sleeve 101. During the initial stamping and drawing process, the punch 102 and the sleeve 101 are driven to move together to press the workpiece into the lower die assembly 3 below. During the next drawing process, the control unit controls the locking assembly 2012 to disengage from the connecting sleeve 2011. When the power rod 202 moves downward to perform the drawing process, only the punch 102 performs the stamping and drawing process.

[0046] The lower mold assembly 3 also includes a die cavity 301, which is a fixed cylinder with openings at the top and bottom. Its inner diameter is adapted to the outer diameter of the sleeve 101. The upper surface of the mold core 302 and the movable nest 303 are both disposed inside the die cavity 301, and their upper surfaces together form the forming bottom surface of the lower mold assembly 3. The die cavity 301 is a die tool used to form the largest diameter die, and it corresponds to the outermost sleeve 101 in the upper mold assembly. The movable nest 303 and the mold core 302 are located below the die cavity 301. The upper end face of the movable nest 303 is flush with the upper end face of the mold core 302, and together they form the bottom surface of the die cavity 301, which is used to form the bottom of the workpiece. The movable nest 303 is fitted onto the mold core 302 and can move axially into the cavity 306 of the die cylinder 301. The number of movable nests 303 entering the cavity 306 of the die cylinder 301 is adjusted according to the number of connections between the locking assembly 2012 and the connecting sleeve 2011. The movable nest 303 includes a forming part 3031 and a flange 3032 connected to each other. The forming part 3031 is adapted to the forming unit 1. The flange 3032 is disposed on the bottom surface of the forming part 3031. The die cylinder 301 is disposed on the die plate 304, and the die plate 304 is provided with a fixing mechanism for locking the push rod 305 after the movable nest 303 reaches the working position. The mold core 302 is fixed below the cavity cylinder 301. Push rods 305 are symmetrically distributed on the bottom surface of the flange 3032, and are connected to each other. The number of movable nests 303 within the cavity 306 of the cavity cylinder 301 is controlled by applying a pushing or pulling force to the flange 3032. The top of each push rod 305 extends to the end face of the flange 3032 near the cavity template 304, and a locking hole is provided at the top of the push rod 305 to cooperate with the fixing mechanism. A fixing hole 3041, adapted to the end of the push rod 305, can be provided on the cavity template 304. A fixing mechanism is provided within the fixing hole 3041. When the movable nest 303 moves to the working position, the end of the push rod 305 is inserted into the fixing hole 3041, and the fixing mechanism fixes the movable nest 303 through the fixing hole 3041. The fixing mechanism can be a hydraulically driven telescopic rod, which is used to fix the push rod 305 by inserting the telescopic rod into the locking hole 3051 at the end of the push rod 305.

[0047] Workflow:

[0048] refer to Figures 2 to 4First deep drawing: The control unit operates the locking block in the locking assembly 2012 to embed into the sleeve 101. The locking block is set on the power rod 202. The locking block can be electrically driven or hydraulically driven. The diameter of the die cylinder 301 corresponds to the diameter of the sleeve 101. The die is also equipped with a pressure ring. First, the pressure ring is used to fix the sheet-like processing part. Then, the power rod 202 drives the punch 102 and the sleeve 101 to cooperate with the die cylinder 301. During this process, the die core 302 and the movable nest 303 at the bottom of the die cylinder 301 form the bottom of the die cylinder 301, so that the processing part completes the first deep drawing.

[0049] Second deep drawing: The push rod 305 and the power rod 202 move upward synchronously, and the movable nest 303 enters the cavity 306 of the die cylinder 301. During the process of changing the diameter, it assists in unloading and ensures that the processed part is nested on the sleeve 101. After the end of the push rod 305 is embedded in the die plate 304 and locked by the fixing mechanism, the movable nest 303 is in the working position. In this working position, the upper end face of the movable nest 303 is flush with the upper end face of the die cylinder 301, and the lower end face is flush with the upper end face of the die core 302. The upper end face of the die core 302 forms the bottom surface of the movable nest 303.

[0050] For the upper mold assembly, since the connecting sleeve 2011 is connected to the sleeve 101, as the power rod 202 moves upward, the sleeve 101 and the punch 102 move upward synchronously to the preset position. Because the connecting sleeve 2011 includes a hollow conical portion 2011B and a cylindrical portion 2011A, with the conical portion 2011B connected to the sleeve 101 and the cylindrical portion 2011A having a connecting hole 203 that mates with the locking assembly 2012, and the end of the power rod 202 having a conical structure, after the locking block completely retracts into the power rod 202, the conical structure... The connecting sleeve 2011 prevents the sleeve 101 from falling directly, and the tapered structure is more conducive to the transmission of pressure from the power rod 202 to the connecting sleeve 2011. The workpiece is still nested in the sleeve 101. During the second drawing operation, the sleeve 101 and the workpiece move with the punch 102 to above the die cylinder 301. Since the movable nest 303 is already inside the die cylinder 301, and the workpiece is above, as the power rod 202 applies pressure to the punch 102 alone, the punch 102 moves downward along the slide groove 104, thus completing the second drawing process. In this process, since the workpiece is still nested in the sleeve 101, the time required for secondary workpiece positioning is avoided, resulting in higher efficiency. While the punch 102 moves upward, the movable nest 303 moves downward to its initial position, awaiting the next processing cycle. Similarly, the drawing principle and steps remain unchanged for three or more drawing operations, and will not be elaborated here.

[0051] It is worth noting that in this embodiment, the punch 102 is the final forming diameter and also the workpiece with the longest stroke. Although the length of the sleeve 101 is the same as that of the punch 102, since the distance it moves downward during forming is controllable, it is not entirely used for deep drawing.

[0052] During the deep drawing process, the die core 302 and the movable nest 303 can also actively move upward to support the bottom surface of the processed part, and the user can change the processing steps according to actual needs.

[0053] Furthermore, this embodiment provides a method for multiple deep drawing operations using a stamping die for irregularly shaped parts, including the following steps:

[0054] S1: Prepare for the Nth deep drawing, where N is initially 1; control the graded drive mechanism 2 so that its connection switching device 201 establishes a connection with the Nth level forming unit 1 corresponding to the target diameter, so as to select the diameter of the working punch 102 for this deep drawing;

[0055] S2: Control the movement of the movable nest 303 of the lower mold assembly 3, so that the forming part 3031 of at least one movable nest 303 rises to the working position, and together with the upper surface of the mold core 302, forms a forming bottom surface that matches the working diameter of the Nth level forming unit 1, and is locked by the fixing mechanism.

[0056] S3: Place the blank between the pressure ring above the die cylinder 301 and the lower die assembly 3;

[0057] S4: Perform the Nth deep drawing: The graded drive mechanism 2 drives the selected Nth level forming unit 1 downward to cooperate with the lower die assembly 3 to complete the Nth deep drawing;

[0058] S5: Determine if the final drawing is complete: If N is less than the preset total number of drawing operations M, then proceed to step S6; if N equals M, then eject the workpiece and the process ends.

[0059] S6: Prepare for the N+1th deep drawing:

[0060] S6.1: The drive unit of the graded drive mechanism 2 drives the formed workpiece and the Nth grade forming unit 1 back to the demolding position;

[0061] S6.2: Control the connection switching device 201 of the graded drive mechanism 2 to disconnect from the Nth level forming unit 1 and establish a connection with the N+1th level forming unit 1 with a smaller diameter;

[0062] S6.3: Control the lower mold assembly 3: drive the movable nest 303, which matches the diameter of the N+1th level forming unit 1, to rise to a new working position and lock it, forming a new forming bottom surface;

[0063] S7: Let N = N + 1, then return to step S4.

[0064] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is obvious that many changes and variations can be made based on the above teachings. Although embodiments of the invention have been shown and described, these specific embodiments are merely explanations of the invention and are not intended to limit it. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. The purpose of selecting and describing exemplary embodiments is to explain the specific principles of the invention and its practical application, so that those skilled in the art, after reading this specification, can make modifications, substitutions, variations, and various choices and changes to the embodiments as needed without departing from the principles and spirit of the invention, provided that such modifications, substitutions, variations, and choices and changes are within the scope of the claims of the invention and are protected by patent law.

Claims

1. A stamping die for irregularly shaped parts, characterized in that, The irregular part stamping die includes an upper die assembly, a lower die assembly (3) and a graded drive mechanism (2). The upper mold assembly includes at least two coaxially arranged forming units (1), at least one of which is a cylindrical forming unit (1), and the at least two forming units (1) can be selectively driven to provide different working diameters; The graded drive mechanism (2) is connected to the upper mold assembly and is used to selectively drive different forming units (1). The lower mold assembly (3) includes a mold core (302) and at least one movable nest (303), which is axially movable relative to the mold core (302) to change the cavity (306) diameter of the lower mold assembly (3) to match the working diameter of the selected forming unit (1) in the upper mold assembly; The graded drive mechanism (2) includes: a power rod (202), which is connected to the innermost forming unit (1) of the upper mold assembly; A connection switching device (201) is provided on the power rod (202). By controlling the working state of the connection switching device (201), it can selectively connect or disconnect with the forming unit (1) at different levels, thereby realizing the switching of power between the forming units (1). The connection switching device (201) includes: a connecting sleeve (2011), which is sleeved on the outside of the power rod (202) and connected to the forming unit (1); A locking assembly (2012) is disposed between the connecting sleeve (2011) and the power rod (202); A control unit is used to control the working state of the locking assembly (2012); The control unit drives the locking assembly (2012) to switch between a locked state and a released state. In the locked state, the locking assembly (2012) fixes the connecting sleeve (2011) to the power rod (202), so that the power energy of the power rod (202) is transmitted to the forming unit (1) through the connecting sleeve (2011). In the released state, the connecting sleeve (2011) is disconnected from the power rod (202).

2. The irregular-shaped stamping die according to claim 1, characterized in that, The at least two-stage forming unit (1) includes a punch (102) and at least one sleeve (101) sleeved outside the punch (102). The outer side of the punch (102) is provided with an axially extending slider (103), and the inner side of the sleeve (101) is provided with an axial groove (104) that slides with the slider (103).

3. The irregular-shaped stamping die according to claim 2, characterized in that, The connecting sleeve (2011) includes a hollow conical part (2011B) and a cylindrical part (2011A). The conical part (2011B) is connected to the sleeve (101), and the cylindrical part (2011A) is provided with a connecting hole (203) that engages with the locking assembly (2012). The end of the power rod (202) is tapered.

4. The irregular part stamping die according to claim 2, characterized in that, The lower mold assembly (3) also includes a concave mold cylinder (301), which is a fixed cylinder with openings at the top and bottom, and its inner diameter is adapted to the outer diameter of the sleeve (101). The upper surface of the mold core (302) and the movable nest (303) are both located inside the concave mold cylinder (301), and their upper surfaces together constitute the forming bottom surface of the lower mold assembly (3).

5. The irregular-shaped stamping die according to claim 4, characterized in that, The active nest (303) includes a forming part (3031) and a flange (3032) connected to each other. The forming part (3031) is adapted to the forming unit (1), and the flange (3032) is disposed on the bottom surface of the forming part (3031).

6. The irregular-shaped stamping die according to claim 5, characterized in that, The flange (3032) is provided with a push rod (305) for driving its axial movement; The concave mold cylinder (301) is disposed on the concave template (304), and the concave template (304) is provided with a fixing mechanism for locking the push rod (305) after the movable nest (303) reaches the working position.

7. The irregular-shaped stamping die according to claim 6, characterized in that, The top of the push rod (305) extends through to the end face of the flange (3032) near the concave template (304), and the top of the push rod (305) is provided with a locking hole that cooperates with the fixing mechanism.

8. A method for performing multiple deep drawing operations using the shaped part stamping die according to any one of claims 7, characterized in that, Includes the following steps: S1: Prepare for the Nth deep drawing, where N is initially 1; control the graded drive mechanism (2) to establish a connection between its connection switching device (201) and the Nth level forming unit (1) with the corresponding target diameter, so as to select the diameter of the working punch (102) for this deep drawing; S2: Control the movement of the movable nest (303) of the lower mold assembly (3) so that the forming part (3031) of at least one movable nest (303) rises to the working position, and together with the upper surface of the mold core (302) forms a forming bottom surface that matches the working diameter of the Nth level forming unit (1), and is locked by the fixing mechanism; S3: Place the blank between the blank holder above the die cylinder (301) and the lower die assembly (3); S4: Perform the Nth deep drawing: The graded drive mechanism (2) drives the selected Nth level forming unit (1) downward, and cooperates with the lower die assembly (3) to complete the Nth deep drawing; S5: Determine if the final drawing is complete: If N is less than the preset total number of drawing operations M, then proceed to step S6; if N equals M, then eject the workpiece and the process ends. S6: Prepare for the N+1th deep drawing: S6.1: The driving unit of the graded driving mechanism (2) drives the formed workpiece and the Nth grade forming unit (1) back to the demolding position; S6.2: Control the connection switching device (201) of the graded drive mechanism (2) to disconnect from the Nth level forming unit (1) and establish a connection with the N+1th level forming unit (1) with a smaller diameter; S6.3: Control the lower mold assembly (3): drive the active nest (303) that matches the diameter of the N+1th level forming unit (1) to rise to a new working position and lock it to form a new forming bottom surface; S7: Let N = N + 1, then return to step S4.

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