Side punching die for thick motor shell

Abstract

The utility model discloses a thick material motor shell side punching die which comprises an upper die assembly, a lower die assembly, a side punching female die and a side punching male die. Meanwhile, the workpiece is positioned; the side punching female die is installed in the lower die assembly in a sliding mode and used for pressing the periphery of the notch of the workpiece. The side punching male die is installed in the lower die assembly in a sliding mode and right faces a notch of a workpiece, and the side punching female die and the side punching male die are located on the inner side and the outer side of the workpiece respectively. When the upper die assembly drives the side punching male die to slide relative to the side punching female die and conduct side punching on a workpiece, the side punching male die and the side punching female die are connected through a self-locking structure, and therefore the side punching male die and the side punching female die are relatively fixed in the vertical direction. According to the thick material motor shell side punching die, when a workpiece is punched, the side punching female die and the side punching male die are connected through the self-locking structure, the stress state of a single part in the side punching process is changed into overall stress, and therefore the punching gap is kept unchanged in the stress process.

Description

Technical Field

[0001] This utility model relates to the field of automotive motor technology, and in particular to a side punching die for a thick-material motor housing. Background Technology

[0002] In daily life, we often see motors, whose housings are generally thin-walled parts. However, in certain special industries or fields, some motors have special requirements. Motor designers will increase the thickness of the motor housing during the design process to meet the requirements of the motor under specific working conditions.

[0003] Figure 1 The image shows a car motor housing (referred to as the workpiece). The notch 5 on its side needs to be cut out using a side punching process. The raw material thickness is 1.5mm. The housing is not large in size, but the material is relatively thick, which is significantly different from our usual motor housings. Our existing side punching mold structure cannot meet the requirements of mass production.

[0004] Figure 2 The diagram shows the structure of an existing thin-walled motor housing side punch die. This structure works fine for materials less than 1.0 mm thick, but when the material thickness exceeds 1.2 mm, the strength and punching stability of the punch slider 1 become significantly insufficient. This causes the punch slider 1 to tilt upwards during the stamping process, ultimately resulting in a smaller punching clearance between the side punch punch 2 and the side punch die 3. Moreover, this change is not constant but gradually increases with the wear of the cutting edges of the side punch punch 2 and the side punch die 3, eventually leading to a negative punch-die clearance. The side punch punch 2 then impacts the side of the side punch die 3, damaging the side punch punch 2, punch slider 1, side punch die 3, and the intermediate side punch positioning post, thus reducing the service life of the die. Utility Model Content

[0005] To address the technical problems of insufficient strength and blanking stability in existing side-punching dies when stamping thicker materials, and the side-punching punch impacting the side-punching die, resulting in a reduced die life, this utility model provides a side-punching die for thick motor housings to solve the above problems.

[0006] This utility model proposes a side punching die for a thick-material motor housing, including an upper die assembly, a lower die assembly, a side punching die, and a side punching punch. The workpiece is located between the upper die assembly and the lower die assembly, and the lower die assembly positions the workpiece. The side punching die is slidably installed in the lower die assembly to press against the outer periphery of the notch of the workpiece. The side punching die is slidably installed in the lower die assembly, facing the notch of the workpiece. The side punching die and the side punch are located on the inner and outer sides of the workpiece, respectively.

[0007] When the upper die assembly drives the side punch to slide relative to the side punch die and perform side punching on the workpiece, the side punch and the side punch die are connected by a self-locking structure, thereby fixing the side punch and the side punch die relative to each other in the vertical direction.

[0008] In an optional embodiment of this utility model, the self-locking structure includes a protrusion and a groove that move synchronously with the side punch and the side punch respectively and are interlocked with each other.

[0009] In an optional embodiment of this utility model, the side punch contacts the inner surface of the workpiece, and the side punch contacts the outer surface of the workpiece.

[0010] In an optional embodiment of this utility model, when the side punch contacts the workpiece surface, the punch is inserted into the groove, and the overlap length between the punch and the groove is greater than or equal to 2mm.

[0011] In an optional embodiment of this utility model, after the side punching is completed, the distance between the end of the protrusion and the inner bottom surface of the groove is 1~1.5mm.

[0012] In an optional embodiment of this utility model, the side punch is fixed to the end of the die slider, the side punch is fixed to the end of the punch slider, the protrusion and the groove are located on the opposite end faces of the die slider and the punch slider, and the die slider and the punch slider are slidably installed in the lower die assembly.

[0013] In an optional embodiment of this utility model, the top of the punch slider is divided into a stamping part and a mating part by a relief groove. The mating part is driven by the upper die assembly to slide horizontally. The side punch is fixed to the stamping part, and when the upper die assembly and the lower die assembly are closed, the stamping part is located inside the workpiece.

[0014] In an optional embodiment of this utility model, the upper mold assembly includes a die driving block and a punch driving block, and the lower mold assembly includes a die back plate and a punch back plate that are fixedly disposed. The die back plate is connected to the die slider through a die reset component, and the punch back plate is connected to the punch slider through a punch reset component. Both the die driving block and the punch driving block push the die slider and the punch slider to move through inclined surfaces.

[0015] In an optional embodiment of this utility model, the upper mold assembly includes an upper template assembly, an upper ejector and an upper ejector reset spring, the lower mold assembly includes a lower template assembly and a positioning post that are fixedly connected, the upper ejector reset spring is located inside the upper template assembly and connected to the upper ejector, and the upper ejector presses the workpiece to abut against the positioning post for positioning.

[0016] In an optional embodiment of this utility model, the upper mold assembly includes a pre-compression rod and a pre-compression spring connected to the upper mold assembly, and the lower mold assembly includes a stripper plate and a stripper reset spring connected to the lower mold assembly. The stripper plate can push the workpiece upward out of the positioning post. When the workpiece abuts against the positioning post, the pre-compression rod presses the stripper plate to the lowest point.

[0017] The beneficial effects of this utility model are:

[0018] (1) The side punching die for the thick material motor housing described in this utility model is connected by a self-locking structure when stamping the workpiece, so as to change the stress state of a single part in the side punching process to the stress state of the whole, so as to keep the punching gap unchanged in the process of being stressed.

[0019] (2) When this utility model is used for stamping thick-walled materials, the service life of the die slider and punch slider is extended from the original direct breakage to more than 300,000 stamping cycles. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a schematic diagram of the motor housing structure;

[0022] Figure 2 This is a schematic diagram of a side punching die for a motor housing in the prior art;

[0023] Figure 3 This is a schematic diagram of the thick material motor housing side punching die of this utility model in the open state;

[0024] Figure 4 This is an assembly diagram of the side punch and the punch slider in this utility model;

[0025] Figure 5 This is an assembly diagram of the side punch die and the die slider in this utility model;

[0026] Figure 6 This is a diagram showing the state of the thick material motor housing side punching die of this utility model when the workpiece is pressed onto the positioning post.

[0027] Figure 7 This is a diagram showing the state of the thick-material motor housing side punching die when it begins to self-lock, as described in this utility model.

[0028] Figure 8 This is a diagram showing the state of the thick-material motor housing side punching die after side punching is completed, as described in this utility model.

[0029] In the diagram, 1. Punch slider, 2. Side punch punch, 3. Side punch die, 4. Workpiece, 5. Notch, 6. Upper die assembly, 601. Upper die base, 602. Upper backing plate, 603. Upper fixing plate, 604. Upper ejector, 605. Upper ejector return spring, 606. Punch drive block, 607. Die drive block, 608. Preload rod, 609. Preload spring, 610. Upper positioning plate, 611. Upper ejector rod, 7. Lower die assembly, 701. Lower die base, 702. Lower die... 703. Backing plate, 704. Lower fixing plate, 705. Positioning pin, 706. Punch back plate, 707. Punch stud, 708. Punch spring, 709. Die back plate, 710. Die stud, 711. Die washer, 712. Die spring, 713. Stripper plate, 714. Stripper return spring, 715. Blanking channel, 716. Die slider, 8. Protrusion, 9. Groove, 10. Relief groove, 11. Stamping part, 12. Mating part. Detailed Implementation

[0030] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0031] Example 1

[0032] like Figures 3-5 As shown, a side punching die for a thick-material motor housing includes an upper die assembly 6, a lower die assembly 7, a side punching die 3, and a side punching die 2. The workpiece 4 is located between the upper die assembly 6 and the lower die assembly 7, and the lower die assembly 7 positions the workpiece 4. The side punching die 3 is slidably installed in the lower die assembly 7 to press against the outer periphery of the notch 5 of the workpiece 4. The side punching die 2 is slidably installed in the lower die assembly 7, facing the notch 5 of the workpiece 4. The side punching die 3 and the side punching die 2 are located on the inner and outer sides of the workpiece 4, respectively.

[0033] The lower die assembly 7 is installed on the machine tool. When the die is closed, the upper die assembly 6 moves closer to the lower die assembly 7 under the action of the press. During this process, the side punch 2 and the side punch die 3 slide laterally and move closer to the workpiece 4. When the side punch die 3 and the side punch 2 press together on the surface of the workpiece 4, the side punch 2 can cut out the notch 5 of the workpiece 4 and separate it from the workpiece 4. The side punch die 3 prevents the surface of the workpiece 4 around the notch 5 from deforming.

[0034] When the upper die assembly 6 drives the side punch 2 to slide relative to the side punch die 3 and perform side punching on the workpiece 4, the side punch 2 and the side punch die 3 are connected by a self-locking structure, thereby fixing the side punch 2 and the side punch die 3 relative to each other in the vertical direction.

[0035] The vertical direction refers to the direction parallel to the movement direction of the upper die assembly 6, that is, perpendicular to the sliding direction of the side punch 2 and the side punch die 3. When the workpiece 4 is side punched, the side punch 2 and the side punch die 3 will not have relative movement in the vertical direction, so there will be no change in the punching clearance (the punching clearance refers to the vertical distance between the side punch 2 and the side punch die 3 sidewalls during the side punching process). Even when used for punching thick-walled workpieces 4, the strength and punching stability of the side punch 2 can be well guaranteed, and there will be no collision between the side punch 2 and the side punch die 3.

[0036] The self-locking structure includes a protrusion 8 and a groove 9 that move synchronously with the side punch 2 and the side punch die 3 and are interlocked with each other. The protrusion 8 can be placed on the side punch 2 and the groove 9 on the side punch die 3, or vice versa. The protrusion 8 can be placed on the side punch die 3 and the side punch 2. The groove 9 and the protrusion 8 are located on the opposite surfaces of the side punch 2 and the side punch die 3, and are interlocked before the side punch 2 and the side punch die 3 contact the workpiece 4, thereby connecting them and preventing deformation in the vertical direction.

[0037] The side punch 2 and side punch 3 are arranged on the inner and outer sides of the workpiece 4. They prevent deformation of the workpiece 4 by applying forces in two directions. Since the surface of the workpiece 4 corresponding to the side punch 2 needs to be removed, this invention preferably places the side punch 2 in contact with the inner surface of the workpiece 4, and the side punch 3 in contact with the outer surface of the workpiece 4. That is, the material corresponding to the notch 5 of the workpiece 4 is pushed outward by the side punch 2 and finally falls into the side punch 3 and is carried out by it. In other optional embodiments, the side punch 2 can also be placed outside the workpiece 4. In this case, the material corresponding to the notch 5 is pushed into the workpiece 4 by the side punch 2. However, since a separate discharge channel 715 is needed to facilitate waste discharge, there may not be enough space inside the workpiece 4 to arrange the discharge channel 715.

[0038] The side punch 3 and side punch 2 are in direct contact with the workpiece 4 and bear the impact pressure. To improve structural strength, the side punch 3 and side punch 2 are made of high-strength materials. However, to save costs, the dimensions of the side punch 3 and side punch 2 need to be as small as possible. Therefore, a die slider 716 and a punch slider 1 driven by the upper die assembly 6 are set in the lower die assembly 7. The side punch 3 is fixed to the end of the die slider 716, and the side punch 2 is fixed to the end of the punch slider 1. The sliding of the die slider 716 and the punch slider 1 drives the side punch 3 and the side punch 2 to move respectively. The protrusion 8 and the groove 9 are located on the opposite end faces of the die slider 716 and the punch slider 1. Figure 5As shown, the side punch die 3 is located at the right end of the die slider 716. The die slider 716 cooperates with the fixed part in the lower die assembly 7 to maintain horizontal sliding. The lower part of the side punch die 3 is a groove 9, and the notch 5 of the side punch die 3 facing the workpiece 4 is hollowed out to accommodate the material to be cut off from the workpiece 4. Figure 4 As shown, the side punch 2 is fixed to the left end of the punch slider 1, the punch 8 is located below the side punch 2, and the punch slider 1 cooperates with the fixed part in the lower die assembly 7 to maintain horizontal sliding.

[0039] The side punch die 3 moves outside the workpiece 4, therefore the shape of the die slider 716 does not require special design. However, the side punch 2 needs to move inside the workpiece 4, while the interaction between the punch slider 1 and the upper die assembly 6 needs to be realized outside the workpiece 4. Therefore, the shape of the punch slider 1 has certain requirements, namely, to achieve the translational movement of the punch slider 1 and the side punch 2 without interfering with the workpiece 4. Specifically, for example... Figure 4 As shown, the top of the punch slider 1 is divided into a stamping part 11 and a mating part 12 by a relief groove 10. The mating part 12 is driven by the upper die assembly 6 to slide horizontally. The side punch 2 is fixed to the stamping part 11, and when the upper die assembly 6 and the lower die assembly 7 are closed, the stamping part 11 is located inside the workpiece 4. Figure 6 As shown, the stamping part 11 and the side punch 2 are inside the workpiece 4. The right half of the side wall of the workpiece 4 is located in the relief groove 10. When the punch slider 1 moves left and right, the right half of the side wall of the workpiece 4 is in the relief groove 10 and will not hinder the movement of the punch slider 1.

[0040] Upper mold component 6:

[0041] Includes the upper template assembly, the upper top member 604, and the upper top member return spring 605, such as Figure 3 As shown, the upper template assembly includes an upper mold base 601, an upper pad 602, an upper fixing plate 603, and an upper positioning plate 610 arranged sequentially from top to bottom. An upper ejector reset spring 605 is installed inside the upper mold base 601, with its upper end fixed to the upper mold base 601 and its lower end connected to the upper ejector 604. The upper ejector 604 can reciprocate within the upper fixing plate 603 and the upper positioning plate 610. The upper ejector 604 is used to press the workpiece 4 downward. In an optional embodiment, an upper ejector rod 611 is provided between the upper ejector 604 and the upper ejector reset spring 605. The upper ejector rod 611 passes through the upper pad 602 and the upper fixing plate 603 and is connected to the upper ejector 604. The upper ejector rod 611 has a small diameter, which can reduce the contact area with the upper fixing plate 603. A limiting surface can be provided at the top of the upper ejector rod 611 to limit the lowest position of the upper ejector 604.

[0042] Lower mold component 7:

[0043] Including the fixedly connected lower template assembly and positioning post 704, such as Figure 3As shown, the lower template assembly includes a lower mold base 701, a lower pad 702, and a lower fixed plate 703 arranged sequentially from bottom to top. The die slider 716 and the punch slider 1 are slidably disposed on the top of the lower fixed plate 703. The positioning post 704 is fixed on the lower fixed plate 703. The upper surface of the positioning post 704 is located above the stamping part 11. When the upper ejector 604 presses the workpiece 4 downward, the workpiece 4 is pressed on the positioning post 704 and positioned by the positioning post 704.

[0044] Drive of punch slider 1:

[0045] The upper die assembly 6 includes a punch drive block 606, and the lower die assembly 7 includes a fixedly mounted punch back plate 705. The punch back plate 705 is connected to the punch slider 1 via a punch reset component. The punch drive block 606 pushes the punch slider 1 to move via an inclined plane. The punch back plate 705 is a fixed component. Under normal conditions, the distance between the punch slider 1 and the punch back plate 705 is small under the action of the punch reset component. When the punch drive block 606 moves downward to contact the punch slider 1, the punch drive block 606 will squeeze between the punch slider 1 and the punch back plate 705 under the action of the inclined plane, thereby pushing the punch slider 1 towards the workpiece 4. The structure of the punch reset component is shown in Figure 3, including a punch stud 706, a punch washer 707, and a punch spring 708. The punch stud 706 is fixed to the punch slider 1, and the two ends of the punch spring 708 abut against the punch washer 707 and the punch back plate 705, respectively.

[0046] The driving principle of the die slider 716 is the same as that of the punch slider 1, and the specific structure is as follows:

[0047] The upper mold assembly 6 includes a die drive block 607, and the lower mold assembly 7 includes a fixed die back plate 709. The die back plate 709 is connected to the die slider 716 via a die reset component. The die drive block 607 pushes the die slider 716 to move via an inclined surface. Normally, the distance between the die slider 716 and the die back plate 709 is small due to the action of the die reset component. When the die drive block 607 moves downwards to contact the die slider 716, the die drive block 607, under the action of the inclined surface, will squeeze between the die slider 716 and the die back plate 709, thereby pushing the die slider 716 towards the workpiece 4. The structure of the die reset component is as follows... Figure 3 As shown, the assembly includes a die stud 710, a die washer 711, and a die spring 712. The die stud 710 is fixed to the die slide 716, and the two ends of the die spring 712 abut against the die washer 711 and the die back plate 709, respectively. Additionally, a blanking channel 715 communicating with the lower template assembly is provided at the die slide 716 for discharging the cut-off waste material.

[0048] Example 2

[0049] During side punching, a larger self-locking distance ensures greater safety and structural stability. Therefore, this embodiment limits this distance. Specifically, when the side punching punch 2 contacts the surface of the workpiece 4, the protrusion 8 is inserted into the groove 9, and the overlap length between the protrusion 8 and the groove 9 is greater than or equal to 2mm, meaning the self-locking distance is greater than or equal to 2mm. In a further design, after the side punching is completed, the distance between the end of the protrusion 8 and the inner bottom surface of the groove 9 is 1~1.5mm to avoid collision between the protrusion 8 and the bottom surface of the groove 9.

[0050] Example 3

[0051] Based on the above embodiments, this embodiment adds an automatic unloading function. The upper mold assembly 6 also includes a preload rod 608 and a preload spring 609 connected to the upper mold plate assembly. The lower mold assembly 7 includes an unloading plate 713 and an unloading reset spring 714 connected to the lower mold plate assembly. The unloading plate 713 can push the workpiece 4 upward out of the positioning post 704. When the workpiece 4 abuts against the positioning post 704, the preload rod 608 presses the unloading plate 713 to the lowest point. The unloading plate 713 can automatically eject the workpiece 4 without manual removal, minimizing damage to the workpiece 4. At the same time, the preload rod 608 is used to press down the unloading plate 713 during mold closing to prevent the unloading plate 713 from obstructing the downward movement of the workpiece 4 to the processing position.

[0052] The side-punching die of this invention, through the self-locking of the punch and die sliders, changes the stress state of individual parts during the side-punching process to that of the entire assembly, thus maintaining the dimensional stability of key components during the stress process. The improved die extends the service life of the die slider and punch slider from direct breakage to over 300,000 punches. Furthermore, the ease of installation and disassembly of each component lays a solid foundation for mass production.

[0053] Working principle:

[0054] Step 1, Positioning of workpiece 4: Workpiece 4 is sent to the side punching station via a conveyor belt or transfer mechanism. The punch press slide drives the upper die assembly 6 to begin moving downwards. First, the upper die guide post enters the lower die guide sleeve (not shown in the figure), precisely positioning the upper and lower dies. The punch press continues to move downwards, and the preload rod 608 begins to contact the stripper plate 713. Since the pressure of the preload spring 609 is much greater than the pressure of the stripper return spring 714, the stripper plate 713 moves downwards. When the stripper plate 713 moves downwards to its lowest point and contacts the lower die base 701, it stops moving. At this time, the upper die assembly 6 continues to move downwards, and the upper ejector 604 contacts the workpiece 4. The upper die assembly 6 continues to move downwards, and when the inner bottom surface of the workpiece 4 contacts the top surface of the positioning post 704, the workpiece 4 stops moving downwards. The workpiece 4 is pressed onto the positioning post 704 by the upper ejector 604 through the elastic pressure of the upper ejector return spring 605. Figure 6 As shown.

[0055] The second step involves the side punch die 3 reaching its position: the upper die assembly 6 continues to move downwards, the upper ejector return spring 605 begins to compress, and the die drive block 607 begins to contact the die slider 716. The upper die assembly 6 continues to move downwards, and the die drive block 607 pushes the die slider 716 towards the center of the die. This distance is calculated; the movement distance of this mechanism is 3mm. At this point, the side punch die 3 is just against the outer surface of the workpiece 4. The die drive block 607 is now fully inserted into the space between the die slider 716 and the die back plate 709, and maintains the position of the die slider 716 unchanged while the die is moving downwards. Figure 7 As shown.

[0056] Third step, self-locking: The upper mold assembly 6 continues to move downwards, the punch drive block 606 begins to contact the punch slider 1, the upper mold assembly 6 continues to move downwards, and the punch drive block 606 pushes the punch slider 1 towards the center of the mold. At this time, the punch slider 1 and the die slider 716 begin to self-lock, as shown... Figure 7 As shown, the self-locking is achieved by inserting the protrusion 8 into the groove 9.

[0057] Step 4: Side Punch: The upper die assembly 6 continues to move downwards. When the self-locking distance between the punch slider 1 and the die slider 716 reaches 2mm (the range can be greater than 2mm, within the limits allowed by the mechanism; the larger the better, but it cannot exceed the length of the punch 8), the side punch punch 2 contacts the inner surface of the workpiece 4, and the side punch action begins to enter the initial state. The upper die assembly 6 continues to move downwards, and the punch drive block 606 continues to push the punch slider 1 towards the center of the die. The side punching operation is completed under the self-locking state of the punch slider 1 and the die slider 716. The punch slider 1 is firmly self-locked by the die slider 716, so that the punching clearance between the side punch punch 2 and the side punch die 3 remains constant. When the punch reaches the bottom dead center position, the entire side punching action is completed. At this time, the safety distance of the self-locking mechanism between the punch slider 1 and the die slider 716 is still 1mm. Figure 8 As shown.

[0058] Step 5, mold opening: As the punch press moves upward, the punch slider 1 moves to the outside of the mold through the punch spring 708 until it is completely disengaged from the self-locking state. The upper mold assembly 6 continues to move upward, and the die slider 716 also moves to the outside of the mold through the die spring 712. When the die drive block 607 completely disengages from the die slider 716, the mold continues to move upward, and the preload rod 608 begins to reset. When the preload rod 608 begins to disengage from the stripper plate 713, the stripper reset spring 714 pushes the stripper plate 713 upward. The stripper plate 713 pushes the workpiece 4 out of the positioning post 704. The punch press continues to move upward, and the upper mold guide post disengages from the lower mold guide sleeve until the punch press reaches the top dead center to complete one punching process.

[0059] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0060] In this specification, the illustrative expressions of the terms do not necessarily refer to the same embodiments. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments.

[0061] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A side punch die for a thick material motor case, characterized by, include: Upper mold component (6); The lower mold assembly (7) is used to position the workpiece (4); The side punch die (3) is slidably installed in the lower die assembly (7) to press against the outer periphery of the notch (5) of the workpiece (4); The side punch (2) is slidably installed in the lower die assembly (7) and is directly opposite the notch (5) of the workpiece (4). The side punch die (3) and the side punch (2) are located on the inner and outer sides of the workpiece (4), respectively. When the upper die assembly (6) drives the side punch (2) to slide relative to the side punch die (3) and perform side punching on the workpiece (4), the side punch (2) and the side punch die (3) are connected by a self-locking structure, thereby fixing the side punch (2) and the side punch die (3) relative to each other in the vertical direction.

2. The thick material motor case side punch die of claim 1, wherein: The self-locking structure includes a protrusion (8) and a groove (9) that move synchronously with the side punch (2) and the side punch (3) and are interlocked with each other.

3. The thick material motor case side punch die of claim 1, wherein: The side punch (2) contacts the inner surface of the workpiece (4), and the side punch (3) contacts the outer surface of the workpiece (4).

4. The thick material motor case side punch die of claim 2, wherein: When the side punch (2) contacts the surface of the workpiece (4), the punch (8) is inserted into the groove (9), and the overlap length of the punch (8) and the groove (9) is greater than or equal to 2 mm.

5. The thick material motor case side punch die of claim 4, wherein: After the side punching is completed, the distance between the end of the protrusion (8) and the inner bottom surface of the groove (9) is 1~1.5mm.

6. The thick stock motor housing side punch die of claim 2 wherein: The side punch die (3) is fixed at the end of the die slider (716), the side punch punch (2) is fixed at the end of the punch slider (1), the protrusion (8) and the groove (9) are located on the opposite end faces of the die slider (716) and the punch slider (1), and the die slider (716) and the punch slider (1) are slidably installed in the lower die assembly (7).

7. The thick material motor housing side punch die of claim 6, wherein: The top of the punch slider (1) is divided into a stamping part (11) and a mating part (12) by a relief groove (10). The mating part (12) is driven by the upper die assembly (6) to slide horizontally. The side punch (2) is fixed to the stamping part (11). When the upper die assembly (6) and the lower die assembly (7) are closed, the stamping part (11) is located inside the workpiece (4).

8. The thick material motor housing side punch die of claim 6, wherein: The upper mold assembly (6) includes a die driving block (607) and a punch driving block (606). The lower mold assembly (7) includes a die back plate (709) and a punch back plate (705) that are fixedly arranged. The die back plate (709) is connected to the die slider (716) through a die reset component. The punch back plate (705) is connected to the punch slider (1) through a punch reset component. The die driving block (607) and the punch driving block (606) both push the die slider (716) and the punch slider (1) to move through inclined surfaces.

9. The thick stock motor housing side punch die of claim 1 wherein: The upper mold assembly (6) includes an upper template assembly, an upper ejector (604) and an upper ejector reset spring (605). The lower mold assembly (7) includes a lower template assembly and a positioning post (704) that are fixedly connected. The upper ejector reset spring (605) is located inside the upper template assembly and is connected to the upper ejector (604). The upper ejector (604) presses the workpiece (4) to abut against the positioning post (704) for positioning.

10. The thick material motor housing side punch die of claim 1, wherein: The upper mold assembly (6) includes a preload rod (608) and a preload spring (609) connected to the upper mold assembly. The lower mold assembly (7) includes a stripper plate (713) and a stripper reset spring (714) connected to the lower mold assembly. The stripper plate (713) can push the workpiece (4) upward out of the positioning post (704). When the workpiece (4) abuts against the positioning post (704), the preload rod (608) presses the stripper plate (713) to the lowest point.

Images