Stamping die with die core convenient to replace

Abstract

The stamping die comprises a die frame assembly and the die core arranged on the die frame assembly, and pressing blocks matched with the die core through dovetail structures and baffles providing counter-acting force are symmetrically arranged on the two sides of the die core. Each pressing block is provided with a telescopic limiting rod, and the baffle is provided with a hook-shaped plate buckled with the limiting rod. According to the innovation, a set of synchronous unlocking structure is arranged, and the structure can synchronously drive the limiting rods on the two sides to move through one-time operation, so that the limiting rods are separated from the hook-shaped plate at the same time, and rapid unlocking and replacement of the mold core are achieved. The problems that in the prior art, die core replacement operation is tedious, efficiency is low, and die core stress is uneven due to single-side unlocking are effectively solved, die replacement efficiency and operation convenience are remarkably improved, and stamping precision and the service life of the die are guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of stamping die technology, and in particular to a stamping die with a conveniently replaceable die core. Background Technology

[0002] In metal stamping production, when faced with a series of products with the same shape but diverse hole patterns, companies typically need to design and manufacture a complete set of dies for each hole pattern. This traditional production model results in huge upfront investments, long manufacturing cycles, and significant downtime for die replacement during product changes, severely impacting overall production costs and delivery cycles, making it difficult for companies to effectively control production progress and costs. To reduce costs, the industry has also attempted to achieve multi-purpose dies by replacing die cores, i.e., changing different die cores on the same die frame to adapt to the stamping requirements of different hole patterns. However, existing die core replacement structures mostly rely on screw tightening or single-sided snap-locking. This method requires operators to repeatedly disassemble and reassemble fasteners during die core replacement, resulting in cumbersome and inefficient operations that greatly increase die changeover time and reduce the overall efficiency of the production line. Furthermore, single-sided snap-locking may lead to uneven stress on the die core, affecting stamping accuracy and die life. Therefore, there is an urgent need for a stamping die structure that, under the condition of a shared die frame, can adapt to different die shapes, has reliable anti-upward and lateral restraint, and allows for convenient die core replacement by a single person to quickly and symmetrically unlock and clamp the die. This is to solve the problems of high cost and inconvenient die replacement in multi-variety production. Existing technologies urgently need improvement to address these issues. Utility Model Content

[0003] This invention aims to solve the problems of fuel pumps and fuel level sensors being easily damaged by impacts, and the difficulty in installing traditional protective devices due to the small diameter of the fuel tank. It provides an impact-resistant dual fuel pump assembly that can effectively protect the fuel pump and fuel level sensor.

[0004] This utility model discloses a stamping die with a convenient core replacement mechanism, aiming to solve the problems of cumbersome operation, low efficiency, and impact on stamping accuracy and die life when replacing the core in existing stamping dies.

[0005] A stamping die with easily replaceable die core includes a die frame assembly and a die core disposed on the die frame assembly; the die core has symmetrically arranged pressure blocks for locking it and baffles for providing reaction force to the pressure blocks on both sides; the pressure blocks and the die core are engaged by a dovetail structure; each pressure block is provided with a retractable limiting rod, and the baffle is provided with a hook-shaped plate that engages with the limiting rod; when the pressure block is pushed into place, the limiting rod engages with the hook-shaped plate; it also includes a synchronous unlocking structure, which is drivenly connected to the limiting rods on both sides, and is configured to synchronously drive the limiting rods on both sides to move in a single operation, so that they simultaneously disengage from the hook-shaped plate engagement state.

[0006] Furthermore, according to the aforementioned stamping die with easily replaceable core, the synchronous unlocking structure includes a bidirectional lead screw mounted on the die frame assembly, two auxiliary push plates that are threadedly engaged with both ends of the bidirectional lead screw, and a rotating wheel for driving the bidirectional lead screw to rotate; the limiting rods on both sides are respectively connected to the corresponding auxiliary push plates for transmission.

[0007] More specifically, in some implementations, according to the above-mentioned stamping die with easily replaceable die core, the die frame assembly is provided with a limiting block for limiting the bidirectional lead screw, the middle part of the bidirectional lead screw is rotatably mounted on the limiting block; the bidirectional lead screw is also provided with two limiting plates, the two limiting plates being located on both sides of the limiting block respectively.

[0008] Preferably, according to the above-mentioned stamping die with easily replaceable die core, the die frame assembly has a groove for the auxiliary push plate to slide.

[0009] Furthermore, according to the aforementioned stamping die with easily replaceable mold core, each limiting rod is connected to a push plate, and a spring for driving the limiting rod to reset is provided between the push plate and the pressure block; the synchronous unlocking structure is connected to the push plates on both sides in a transmission connection.

[0010] More specifically, in some implementation schemes, according to the aforementioned stamping die with easily replaceable core, each limit rod is connected to the corresponding push plate via a push rod.

[0011] Preferably, in the above-mentioned stamping die with easily replaceable die core, the pressure block is provided with a dovetail boss, and the side wall of the die core is provided with a dovetail groove that mates with the dovetail boss.

[0012] Preferably, in the above-mentioned stamping die with easily replaceable die core, the pressure block is provided with a through slot for the limiting rod to pass through.

[0013] Preferably, according to the above-mentioned stamping die with easily replaceable die core, the hook plate includes a hook plate fixed on the baffle, and a gap is formed between the hook plate and the baffle for the movement of the limiting rod.

[0014] Preferably, according to the above-mentioned stamping die with easily replaceable die core, the die frame assembly includes an upper die frame, a lower die frame, and a guide post connecting the upper die frame and the lower die frame; the die core is disposed on the lower die frame.

[0015] This invention introduces a synchronous unlocking structure, which is connected to the limiting rods on both sides and is designed to simultaneously drive the limiting rods to move in a single operation, causing them to disengage from the hook plate. This transforms the mold core unlocking process from the traditional step-by-step, unilateral operation to a synchronous, single-operation process, greatly simplifying the mold change process and significantly shortening the mold change time. Compared with existing technologies, this invention not only solves the problem of repeated disassembly and assembly of screw clamping methods but also overcomes the drawbacks of uneven force on the mold core, affecting stamping accuracy and mold life, which may be caused by unilateral buckling. The synchronous unlocking of the limiting rods on both sides ensures the force balance of the mold core during replacement, thereby improving stamping accuracy and the overall service life of the mold. Therefore, under the condition of a shared mold frame, this invention can adapt to different hole types, has reliable anti-push-up and lateral restraint capabilities, and can be quickly completed by a single person for symmetrical unlocking and clamping. This effectively solves the problems of high cost and inconvenient mold change in multi-variety production, improving the overall efficiency and economic benefits of the production line. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a stamping die with a replaceable core.

[0017] Figure 2 This is an enlarged view of the easily replaceable structural area of ​​a stamping die with a replaceable core.

[0018] Figure 3 This is a schematic diagram showing the separation of the stamping die block and the die core, which allows for easy replacement of the die core.

[0019] Figure 4 This is a cross-sectional view of a convenient replacement structure for a stamping die with an easily replaceable core.

[0020] Figure 5 This is a bottom schematic diagram of a quick-release component structure for a stamping die with easily replaceable die cores.

[0021] Attached icon numbers:

[0022] 1. Mold frame assembly; 11. Upper mold frame; 12. Lower mold frame; 13. Guide post; 2. Mold core; 21. Dovetail groove; 3. Pressure block; 31. Dovetail boss; 32. Through slot; 4. Baffle; 5. Hook plate; 51. Hook plate; 6. Limiting rod; 61. Push rod; 62. Push plate; 63. Spring; 7. Synchronous unlocking structure; 71. Two-way lead screw; 711. Lead screw nut; 72. Limiting block; 73. Auxiliary push plate; 731. Slide groove; 74. Rotary wheel; 75. Limiting piece; 8. Support leg. Detailed Implementation

[0023] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0024] In metal stamping production, when faced with a series of products with the same shape but diverse hole patterns, companies typically design and manufacture a complete set of molds for each hole pattern. This results in high upfront investment, long manufacturing cycles, and frequent downtime for mold replacement, making it difficult to control overall production costs and delivery time. To reduce costs, the industry has also attempted to achieve multi-purpose molds by replacing the mold core. However, existing structures mostly rely on screw clamping or single-sided snap-locking, requiring repeated disassembly and reassembly of fasteners during replacement, making the operation cumbersome and inefficient.

[0025] To address this issue, this application proposes a stamping die with a conveniently replaceable die core, comprising a die frame assembly 1 and a die core 2 mounted on the die frame assembly 1; symmetrically arranged on both sides of the die core 2 are pressure blocks 3 for locking it and baffles 4 for providing reaction force to the pressure blocks 3; the pressure blocks 3 and the die core 2 are engaged by a dovetail structure; each pressure block 3 is provided with a retractable limiting rod 6, and the baffle 4 is provided with a hook-shaped plate 5 that engages with the limiting rod 6; when the pressure block 3 is pushed into place, the limiting rod 6 engages with the hook-shaped plate 5; a synchronous unlocking structure 7 is also included, which is connected to the limiting rods 6 on both sides in a transmission connection. The synchronous unlocking structure 7 is configured to synchronously drive the limiting rods 6 on both sides to move in a single operation, causing them to simultaneously disengage from the hook-shaped plate 5. By introducing the synchronous unlocking structure 7, this application achieves rapid and synchronous unlocking of the die core 2, greatly simplifying the die changing operation, improving production efficiency, and effectively reducing operational risks.

[0026] The die frame assembly 1 is the basic frame of the stamping die, typically consisting of an upper die frame 11, a lower die frame 12, and guide pillars 13, providing stable support and guidance. The die core 2 is the part of the stamping die that directly contacts the workpiece; its shape determines the hole type of the stamped part and is a key replaceable component for achieving "multi-purpose die". The pressure block 3 and the baffle 4 are structures used to fix the die core 2. The pressure block 3 engages with the die core 2 via a dovetail structure, providing locking force, while the baffle 4 provides a reaction force to ensure the stability of the die core 2. The limiting rod 6 and the hook plate 5 form a self-locking mechanism. When the pressure block 3 is pushed into place, the limiting rod 6 automatically engages with the hook plate 5, achieving secondary locking of the pressure block 3. The core of this application's stamping die with easily replaceable die core lies in the design of the synchronous unlocking structure 7, aiming to solve the problems of cumbersome and inefficient operation when changing die cores in traditional dies.

[0027] Specifically, the mold base assembly 1, as the supporting structure of the entire mold, is crucial to its stability. Mold base assembly 1 can be made of high-strength steel to ensure it can withstand enormous impact forces during stamping. The mold core 2 is a replaceable component, and its design should consider the needs of different hole types, allowing for customization according to actual production requirements. The fitting accuracy between the mold core 2 and mold base assembly 1 directly affects the quality of the stamped parts; therefore, tolerances must be strictly controlled during manufacturing.

[0028] The arrangement of the pressure block 3 and the baffle 4 provides a reliable locking mechanism for the die core 2. The dovetail structure between the pressure block 3 and the die core 2 is a common self-locking structure that effectively prevents displacement of the die core 2 during stamping. The dovetail structure can be designed in various forms; for example, a dovetail boss 31 can be set on the pressure block 3, while a dovetail groove 21 that mates with the dovetail boss 31 is provided on the side wall of the die core 2. This design not only provides strong locking force but also resists upward pulling force to a certain extent. The baffle 4 provides stable reaction force support for the pressure block 3, ensuring the effective transmission of locking force.

[0029] The cooperation between the limiting rod 6 and the hook plate 5 further enhances the locking reliability of the mold core 2. When the pressure block 3 is pushed into place, the limiting rod 6 automatically extends and engages with the hook plate 5, forming a secondary lock. This self-locking mechanism avoids the tediousness of manual operation and improves the efficiency and reliability of locking. The limiting rod 6 can be designed as a spring-loaded type, so that it automatically pops out when the pressure block 3 is pushed into place and automatically resets when unlocking. The hook plate 5 can be fixed on the baffle 4, and a gap is formed between its hook plate 51 and the baffle 4 to allow the limiting rod 6 to move, so that the limiting rod 6 can smoothly engage and disengage.

[0030] Traditional mold unlocking often requires operating the locking mechanisms on both sides separately, which is not only time-consuming but can also lead to jamming or damage to the mold core 2 due to asynchronous operation. The synchronous unlocking structure 7, however, can simultaneously drive the limit rods 6 on both sides to move in a single operation, causing them to disengage from the hook plate 5 at the same time, greatly simplifying the operation process. For example, the synchronous unlocking structure 7 may include a bidirectional lead screw 71 mounted on the mold frame assembly 1, two auxiliary push plates 73 threaded to both ends of the bidirectional lead screw 71, and a rotating wheel 74 for driving the bidirectional lead screw 71 to rotate. The limit rods 6 on both sides are respectively connected to the corresponding auxiliary push plates 73. When the rotating wheel 74 rotates, the bidirectional lead screw 71 synchronously drives the auxiliary push plates 73 on both sides to move inward or outward, thereby causing the limit rods 6 to simultaneously disengage or engage. This design ensures the synchronicity of the mold core 2 during unlocking and locking, avoiding the risks caused by asynchronous operation.

[0031] Furthermore, the synchronous unlocking structure 7 ensures the synchronous movement of the limit rods 6 on both sides, effectively avoiding the risk of jamming, uneven loading, or damage to the mold core 2 due to asynchronous operation, thus improving the safety and reliability of the mold. The dovetail structure, along with the pressure block 3 and baffle 4, and the secondary locking mechanism of the limit rods 6 and hook plate 5, together provide reliable anti-upward and lateral restraint capabilities for the mold core 2, ensuring the stability and positioning accuracy of the mold core 2 during the stamping process. These innovations make the stamping mold of this application superior to existing technologies in terms of convenience, efficiency, and reliability, providing an effective solution to the problems of high cost and inconvenient mold changing in multi-variety production.

[0032] First, when it is necessary to replace the mold core 2, the operator performs a single operation through the synchronous unlocking structure 7. For example, the operator can rotate the rotating wheel 74 to drive the bidirectional lead screw 71 to rotate. Since the two ends of the bidirectional lead screw 71 are respectively threaded with two auxiliary push plates 73, and the bidirectional lead screw 71 is limited by the limiting block 72, the rotation of the bidirectional lead screw 71 will synchronously drive the auxiliary push plates 73 on both sides to move inward or outward.

[0033] When the auxiliary push plate 73 moves inward, it pushes the two limit rods 6 on both sides that are connected to its own transmission. Under the push of the auxiliary push plate 73, the limit rods 6 overcome the elastic force of the spring 63 and move inward, disengaging from the hook plate 5. Since the synchronous unlocking structure 7 ensures the synchronous movement of the two limit rods 6, the two limit rods 6 will simultaneously disengage from the hook plate 5, thereby releasing the lock on the pressure block 3.

[0034] Once the limit rod 6 disengages, the pressure block 3 is no longer locked a second time. At this point, the operator can easily remove the pressure block 3 from both sides of the mold core 2. Because the pressure block 3 and the mold core 2 are engaged by a dovetail structure, the mold core 2 can be removed from the mold frame assembly 1 after the pressure block 3 is removed.

[0035] Next, the new mold core 2 is placed on the mold frame assembly 1. After the new mold core 2 is in place, the operator pushes the pressure block 3 in the dovetail direction to engage with the dovetail structure of the mold core 2. When the pressure block 3 is pushed in, its limiting rod 6 will automatically extend under the action of the spring 63 and engage with the hook plate 5 on the baffle 4, completing the secondary locking of the pressure block 3. The entire locking process requires no additional operation and achieves automatic locking.

[0036] Through the above process, the replacement of mold core 2 can be completed quickly and conveniently. The synchronous unlocking structure 7 ensures the synchronicity and efficiency of the unlocking process, avoiding the jamming or damage problems caused by asynchronous operation on both sides in traditional molds. The self-locking mechanism of the limit rod 6 and the hook plate 5 ensures the reliability of mold core 2 after locking. This structure works in tandem, greatly improving the mold changing efficiency and operational safety of stamping dies, and effectively solving the problems of long mold changing time and cumbersome operation in multi-variety production.

[0037] This application further proposes a synchronous unlocking structure 7, which includes a bidirectional lead screw 71 mounted on the mold frame assembly 1, two auxiliary push plates 73 that are threaded to both ends of the bidirectional lead screw 71, and a rotating wheel 74 for driving the bidirectional lead screw 71 to rotate; the limit rods 6 on both sides are respectively connected to the corresponding auxiliary push plates 73 for transmission.

[0038] The bidirectional lead screw 71 refers to a lead screw with left- and right-hand threads, characterized in that when the lead screw rotates, the nuts or mating parts at its two ends move in opposite directions. In this application, the bidirectional lead screw 71 is cleverly applied to the synchronous unlocking structure 7 to achieve synchronous movement of the limit rods 6 on both sides. The auxiliary push plate 73 is a component that is threadedly engaged with the bidirectional lead screw 71, and its function is to convert the rotational motion of the bidirectional lead screw 71 into linear motion, and further transmit this linear motion to the limit rods 6. The rotating wheel 74 is an operating component used to drive the rotation of the bidirectional lead screw 71. It can be designed as a handwheel, handle, or other structure suitable for manual or automated operation, so as to facilitate the user's unlocking operation.

[0039] Furthermore, the mold frame assembly 1 is provided with a limiting block 72 for limiting the bidirectional lead screw 71, and the middle part of the bidirectional lead screw 71 is rotatably mounted on the limiting block 72; the bidirectional lead screw 71 is also provided with two limiting pieces 75, which are located on both sides of the limiting block 72 respectively.

[0040] The limiting block 72 is designed to be fixedly connected to the mold frame assembly 1. It has a through hole inside that matches the outer diameter of the bidirectional lead screw 71, allowing the bidirectional lead screw 71 to rotate freely within the through hole while its axial movement is restricted. The limiting piece 75 is typically an annular structure, fixed to the bidirectional lead screw 71 by means of threads or keys, and tightly fitted to both sides of the limiting block 72, thereby effectively constraining the axial position of the bidirectional lead screw 71.

[0041] The mold frame assembly 1 has a groove 731 for the auxiliary push plate 73 to slide. This design ensures the stability and accuracy of the auxiliary push plate 73 during movement. The groove 731 is a pre-cut recessed structure with a specific length and width on the mold frame assembly 1, whose main function is to provide a predetermined movement trajectory for the auxiliary push plate 73. Specifically, the size and shape of the groove 731 need to be adapted to the auxiliary push plate 73 to ensure that the auxiliary push plate 73 can slide smoothly within the groove 731 without jamming or loosening.

[0042] In the above embodiments of this application, the mold core 2 is locked by pressure blocks 3 on both sides. The pressure blocks 3 and the mold core 2 are fitted with a dovetail structure. Although this structure can fix the mold core 2, in practical applications, the fitting accuracy between the pressure blocks 3 and the mold core 2 directly affects the fixing effect of the mold core 2. If the fitting accuracy is not high, the mold core 2 may loosen during the stamping process, affecting the stamping quality and efficiency. To address this, this application has specifically designed the dovetail structure between the pressure blocks 3 and the mold core 2. By optimizing the specific form of the dovetail structure, the reliability and stability of fixing the mold core 2 are improved.

[0043] The dovetail boss 31 refers to the protruding part on the pressure block 3 that mates with the dovetail groove 21 on the side wall of the mold core 2. The dovetail groove 21 is a recess on the side wall of the mold core 2 that matches the shape of the dovetail boss 31. Specifically, the cross-section of the dovetail boss 31 can be designed as a standard dovetail shape, or it can be appropriately deformed according to actual needs. For example, an arc-shaped dovetail can be used to improve its wear resistance and strength. The shape of the dovetail groove 21 should correspond to the dovetail boss 31 to ensure a tight fit between the two.

[0044] The pressure block 3 has a through slot 32 for the limiting rod 6 to pass through, which provides the necessary space for the movement of the limiting rod 6. Specifically, as a key component of the locking structure of the mold core 2, the optimization of the structure of the pressure block 3 is directly related to the overall stability and reliability of the mold.

[0045] The through slot 32 refers to a channel opened on the pressure block 3 that allows the limiting rod 6 to pass freely. The size and position of this slot 32 need to be precisely designed to ensure that the limiting rod 6 is not obstructed during extension and retraction, thereby ensuring that it can smoothly engage or disengage with the hook plate 5. As a preferred embodiment, the cross-section of the through slot 32 can be slightly larger than the cross-section of the limiting rod 6 to reduce friction and wear and improve the service life of the limiting rod 6.

[0046] Based on the above-described embodiments of this application, in order to further optimize the structure of the limiting rod 6, this application proposes a specific hook plate 5 structure. Specifically, the hook plate 5 includes a hook plate 51 fixed on the baffle 4, and a gap is formed between the hook plate 51 and the baffle 4 for the limiting rod 6 to move.

[0047] The hook plate 51, as a major component of the hook-shaped plate 5, primarily functions to cooperate with the limiting rod 6 to achieve the locking function of the pressure block 3. The hook plate 51 can be made of materials with a certain strength, such as metal or plastic, and is fixed to the baffle 4 by welding, bolting, or other methods. The shape of the hook plate 51 can be designed according to actual needs; for example, it can be designed as an arc or a straight line.

[0048] The gap between the baffle 4 and the hook plate 51 provides space for the movement of the limiting rod 6. The size of the gap should be reasonably designed according to the dimensions and travel of the limiting rod 6 to ensure that the limiting rod 6 can smoothly enter and disengage from the hook plate 51. As a preferred embodiment, the gap is slightly larger than the diameter of the limiting rod 6, thereby ensuring that the limiting rod 6 can move freely and avoiding jamming.

[0049] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A press die which can be easily changed with a core, characterized by, The utility model provides a mould core locking mechanism, including mould frame assembly (1) and the mould core (2) of setting on mould frame assembly (1), two sides of mould core (2) symmetry are equipped with the pressure block (3) for locking it and the baffle (4) for providing the reaction force for pressure block (3), and the dovetail structure cooperation between pressure block (3) and mould core (2), each pressure block (3) is equipped with retractable limit rod (6), and baffle (4) is equipped with with limit rod (6) cooperation's hooking plate (5), when pressure block (3) pushes in to the place, limit rod (6) and hooking plate (5) buckle, still including a set of synchronous unlocking structure (7), synchronous unlocking structure (7) with both sides limit rod (6) transmission connection, synchronous unlocking structure (7) is set as, through single operation can synchronous drive both sides limit rod (6) movement, makes it simultaneously separate from the buckle state of hooking plate (5).

2. The replaceable core punch die according to claim 1, wherein The synchronous unlocking structure (7) includes a bidirectional screw rod (71) arranged on the mould frame assembly (1), two auxiliary push plates (73) respectively threadedly matched with two ends of the bidirectional screw rod (71), and a rotating wheel (74) for driving the bidirectional screw rod (71) to rotate; the limit rods (6) on both sides are respectively in transmission connection with the corresponding auxiliary push plates (73).

3. The replaceable core punch die of claim 2, wherein, The mould frame assembly (1) is provided with a limiting block (72) for limiting the bidirectional screw rod (71), and the middle part of the bidirectional screw rod (71) is rotatably arranged on the limiting block (72); the bidirectional screw rod (71) is further provided with two limiting sheets (75), and the two limiting sheets (75) are respectively located on the two sides of the limiting block (72).

4. The replaceable core punch die of claim 2, wherein, The mould frame assembly (1) is provided with a sliding groove (731) for sliding of the auxiliary push plate (73).

5. The readily replaceable core punch die of claim 1 wherein, Each limit rod (6) is connected with a push plate (62), and a spring (63) for driving the limit rod (6) to reset is arranged between the push plate (62) and the pressure block (3); the synchronous unlocking structure (7) is in transmission connection with the push plates (62) on both sides.

6. The readily replaceable core punch die according to claim 5, wherein Each limit rod (6) is connected with the corresponding push plate (62) through a push rod (61).

7. The readily replaceable core punch die of claim 1 wherein, The pressure block (3) is provided with a dovetail boss (31), and a dovetail groove (21) matched with the dovetail boss (31) is formed in the side wall of the mould core (2).

8. The readily replaceable core punch die of claim 1, wherein, The pressure block (3) is provided with a through slot (32) for penetrating the limit rod (6).

9. The readily replaceable core punch die of claim 1, wherein, The hooking plate (5) includes a hook plate (51) fixed on the baffle (4), and a gap for movement of the limit rod (6) is formed between the hook plate (51) and the baffle (4).

10. The readily replaceable core punch die of claim 1, wherein, The mould frame assembly (1) includes an upper mould frame (11), a lower mould frame (12), and a guide column (13) connecting the upper mould frame (11) and the lower mould frame (12); and the mould core (2) is arranged on the lower mould frame (12).

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