Terminal cold heading forming module

Abstract

The utility model discloses a terminal cold heading forming module, which relates to the technical field of dies, and comprises a first die, the first die comprises a first main die and a first punching die, the first main die is provided with a pre-forming die cavity with an opening facing the first punching die, and the size of one end, close to the opening, of the pre-forming die cavity is gradually enlarged towards the opening direction. The end, close to the opening of the pre-forming die cavity, of the pre-forming die cavity is arranged to be of a structure with the size gradually increased in the direction of the opening, a space for outward deformation is provided for one end of a workpiece material, and therefore the pre-forming structure with the structure gradually expanded outwards is formed under the stamping action of the first stamping die; therefore, the material of the structure is uniformly distributed, the subsequent flange plate structure forming step is more regular, the material deviation condition is reduced or even avoided, the blank raw material consumption is reduced, the material utilization rate of the terminal cold heading process is improved, and the material cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, in particular to a terminal cold heading forming module. Background Art

[0002] Cold heading is a process that utilizes the plastic deformation of metal under the action of external force, and redistributes and transfers the metal volume with the help of a mold at room temperature, thereby forming the required parts or blanks. Compared with other conventional processes, cold heading has the advantages of improving the mechanical properties of parts, increasing material utilization, and improving production efficiency. Therefore, the economic benefits of cold heading are significant, and it is often used in the manufacture of standard parts (various screws and nuts). Of course, relatively complex special-shaped parts can also be processed and formed by cold heading.

[0003] like Fig.13 As shown, taking the terminal of a power battery as an example, the top of the terminal of the power battery is provided with a flange structure with an opening facing downward, and the flange structure is formed by stamping (extrusion) during the cold heading process. However, during the formation of the above-mentioned flange structure, the workpiece material is located in the mold and is prone to offset during the material transfer process, resulting in uneven material distribution of the flange structure in the pre-forming state. In order to ensure the yield of the terminal, the amount of raw materials used in the blank needs to be appropriately increased so that during the forming process of the terminal, the part with less flange structure material can also meet the corresponding process requirements, which results in a relatively large amount of excess material that needs to be cut off from the flange structure, thereby reducing material utilization and increasing material costs. Utility Model Content

[0004] The purpose of the embodiments of the utility model is to provide a terminal cold heading forming module, which can solve the above-mentioned problems existing in the prior art.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] Provided is a terminal cold heading forming module, comprising:

[0007] A first mold, the first mold includes a first main mold and a first punching die, and the first main mold and the first punching die can reciprocate between positions close to each other and away from each other;

[0008] The first main mold is provided with a preforming mold cavity with an opening toward the first punching die, and a size of the preforming mold cavity gradually increases toward the opening direction from an end close to the opening;

[0009] The first punch die is provided with a first punch rod extending toward the preforming cavity. When the first punch die and the first main die are in a mutually close position, the first punch rod is inserted into the preforming cavity through the opening of the preforming cavity.

[0010] As an optional embodiment, the preforming cavity comprises:

[0011] A first shaping section is located at an end of the preforming cavity away from its opening;

[0012] The first molding section is located at one end of the pre-molding cavity close to its opening. The first molding section is connected to the first shaping section, and the first molding section gradually increases in size from one end close to the first shaping section toward the opening.

[0013] As an optional implementation, it also includes:

[0014] A second mold, wherein the first mold and the second mold are arranged in sequence, and the second mold comprises a second main mold and a second punching die;

[0015] The second main die is provided with a first fixed die cavity opening toward the second punch die;

[0016] The second punching die is provided with a shaping cavity opposite to the first fixed cavity. The cross-section of the shaping cavity is rectangular, and the radial dimension of the shaping cavity is greater than the radial dimension of the preforming cavity.

[0017] As an optional embodiment, the cavity wall of the first fixed mold cavity close to its opening end is configured as an arc-shaped cavity wall; and

[0018] The distance between any two opposite arc-shaped cavity walls gradually increases toward the opening direction of the first fixed mold cavity.

[0019] As an optional implementation, it also includes:

[0020] A third mold, wherein the first mold, the second mold and the third mold are arranged in sequence, and the third mold comprises a third main mold and a third punching die;

[0021] The third main die is provided with a second fixed die cavity opening toward the third punch die;

[0022] When the third punch die and the third main die are in a position close to each other, a flat extrusion space is formed between the third punch die and the third main die, and the extrusion space is connected to the second fixed die cavity.

[0023] As an optional embodiment, the cavity wall of the first fixed mold cavity close to its opening end is set as a first arc-shaped cavity wall, and the distance between any two opposite first arc-shaped cavity walls gradually increases toward the opening direction of the first fixed mold cavity;

[0024] The cavity wall of the second fixed mold cavity close to the opening end thereof is configured as a second arc-shaped cavity wall, and the distance between any two opposite second arc-shaped cavity walls gradually increases toward the opening direction of the second fixed mold cavity; and

[0025] The curvature of the second curved cavity wall is greater than the curvature of the first curved cavity wall.

[0026] As an optional embodiment, one side of the third punching die used to form the extrusion space is a plane;

[0027] A side surface of the third main mold for forming the extrusion space is a curved surface, and a distance between the curved surface and the plane gradually increases from a direction close to the second fixed mold cavity to a direction away from the second fixed mold cavity.

[0028] As an optional implementation, it also includes:

[0029] A fourth mold, wherein the first mold, the second mold, the third mold and the fourth mold are arranged in sequence, and the fourth mold comprises a fourth main mold and a fourth punching die;

[0030] The fourth main die is provided with a third fixed die cavity opening toward the fourth punch die, and a first extrusion groove arranged around the opening of the third fixed die cavity, and a first extrusion protrusion is arranged around the third fixed die cavity and the first extrusion groove;

[0031] The fourth punch is provided with a second extrusion groove. When the fourth punch is close to the fourth main die, the groove wall of the second extrusion groove surrounds the outer periphery of the first extrusion protrusion and is spaced apart from the first extrusion protrusion.

[0032] As an optional implementation, it also includes:

[0033] A fifth mold, wherein the first mold, the second mold, the third mold, the fourth mold and the fifth mold are arranged in sequence, and the fifth mold comprises a fifth main mold and a fifth punching die;

[0034] The fifth main die is provided with a fourth fixed die cavity opening toward the fifth punch die, and a third extrusion groove arranged around the opening of the fourth fixed die cavity, and a second extrusion protrusion is arranged around the fourth fixed die cavity and the third extrusion groove;

[0035] The depth of the third extrusion groove is smaller than the depth of the first extrusion groove.

[0036] As an optional implementation, it also includes:

[0037] A sixth mold, wherein the first mold, the second mold, the third mold, the fourth mold, the fifth mold and the sixth mold are arranged in sequence, and the sixth mold includes a sixth main mold and a sixth punching die;

[0038] The sixth main mold is provided with a fifth fixed mold cavity opening toward the sixth punching die, and the sixth main mold is further provided with a trimming mold spaced around the outer periphery of the fifth fixed mold cavity.

[0039] The beneficial effects of the utility model are as follows: in the first mold included in the terminal cold heading forming module group, the first main mold is provided with a preforming mold cavity with an opening facing the first punching die, and the end of the preforming mold cavity close to the opening is set as a structure with a size gradually expanding in the direction of the opening, providing a space for one end of the workpiece material to deform in an outer shape, so that a preforming structure with a structure gradually expanding outward is formed under the punching action of the first punching die. Since the deformation amount of the preforming structure is relatively small, the material of the structure is also evenly distributed, so that the subsequent flange structure forming steps are more regular, the occurrence of material deviation is reduced or even avoided, the amount of raw materials used for the blank is reduced, the material utilization rate of the terminal cold heading process is improved, and the material cost is reduced;

[0040] At the same time, the pre-forming structure can also reduce the forming pressure of the subsequent flange structure, avoiding stress concentration and poor material flow during the one-time forming process. The problem of mold wear caused by poor material flow is also improved accordingly, extending the service life of the mold while ensuring the regularity of the workpiece material. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The utility model is further described in detail below based on the drawings and embodiments.

[0042] Figure 1 This is a partial front view of the first mold in the embodiment of the utility model;

[0043] Figure 2 This is a partial side view of the first mold in the embodiment of the utility model;

[0044] Figure 3 The front view, side view and bottom view of the workpiece material after the preforming step described in the embodiment of the utility model;

[0045] Figure 4 This is a partial front view of the second mold in the embodiment of the utility model;

[0046] Figure 5 The front view, top view and bottom view of the workpiece material after the secondary shaping step described in the embodiment of the utility model;

[0047] Figure 6 This is a partial front view of the third mold described in the embodiment of the utility model;

[0048] Figure 7 The front view, top view and bottom view of the workpiece material after the flange forming step described in the embodiment of the utility model;

[0049] Figure 8 This is a partial front view of the fourth mold described in the embodiment of the utility model;

[0050] Fig. 9 The front view, top view and bottom view of the workpiece material after the flange bending step described in the embodiment of the utility model;

[0051] Fig.10 This is a partial front view of the fifth mold according to the embodiment of the utility model;

[0052] Fig.11 The front view, top view and bottom view of the workpiece material after the flange extrusion step described in the embodiment of the utility model;

[0053] Fig.12 This is a partial front view of the sixth mold according to the embodiment of the utility model;

[0054] Fig.13 These are the front view, side view, top view and bottom view of the workpiece material after the flange trimming step described in the embodiment of the utility model.

[0055] In the figure: 10, first mold; 11, first main mold; 111, preforming mold cavity; 1111, first shaping section; 1112, first molding section; 12, first punch; 121, first punch rod; 20, second mold; 21, second main mold; 211, first fixed mold cavity; 2111, first arc-shaped cavity wall; 22, second punch; 221, second punch rod; 222, shaping mold cavity; 30, third mold; 31, third main mold; 311, second fixed mold cavity; 3111, second arc-shaped cavity wall; 32, third punch; 321, third punch rod; 322, contact cavity; 33, extrusion space; 40, fourth mold; 41, fourth main mold; 411, third fixed mold cavity; 412 , the first extrusion groove; 413, the first extrusion protrusion; 42, the fourth punch; 421, the fourth punch; 422, the second extrusion groove; 50, the fifth mold; 51, the fifth main mold; 511, the fourth fixed mold cavity; 512, the third extrusion groove; 513, the second extrusion protrusion; 52, the fifth punch; 521, the fifth punch; 522, the fourth extrusion groove; 60, the sixth mold; 61, the sixth main mold; 611, the fifth fixed mold cavity; 62, the sixth punch; 621, the sixth punch; 622, the trimming mold; 70, the main part; 71, the pre-forming structure; 72, the secondary shaping structure; 73, the flange structure; 74, the flange structure; 75, the convergence section; 76, the end point; 77, the bending structure. DETAILED DESCRIPTION

[0056] In order to make the technical problems solved by the utility model, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the utility model are further described in detail below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0057] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0059] The cold heading process is a new metal pressure processing process with little or no cutting. It is mainly used to produce standard fasteners such as bolts, screws, nuts, rivets, pins, etc. Of course, special-shaped parts with relatively complex structures can also be processed and formed by the cold heading process.

[0060] Among them, the cold heading process utilizes the plastic deformation of metal under the action of external force, and with the help of a mold at room temperature, redistributes and transfers the metal volume to form the required parts or blanks.

[0061] Compared with other conventional processing methods (such as cutting processing), cold heading process has the advantages of improving the mechanical properties of metal parts, increasing material utilization, improving productivity, improving product surface finish and ensuring product precision.

[0062] In general, the parts formed by cold heading process basically include the following main process flows:

[0063] Material preparation: prepare appropriate raw materials according to product drawings or production requirements;

[0064] Cutting: Use the cutting mechanism to cut the raw materials into lengths that meet the processing requirements;

[0065] Head forming: Put the cut raw materials into the cold heading machine and form them through the head stamping.

[0066] Edge trimming: Use the edge trimming mechanism to cut the edges of the formed parts smoothly.

[0067] From the above, we can see that the cold heading process has been widely used in mechanical manufacturing, especially in the production of standard fasteners, due to its many advantages.

[0068] Please refer to the attached Fig.13In this embodiment, the terminal of the power battery (hereinafter referred to as the terminal) is formed by cold heading process as an example. The top of the terminal (the side close to the top of the figure) is provided with a flange structure with an opening facing downward, an end point is convexly provided on the flange structure, and the lower part of the flange structure is provided with a main body. In the specific application scenario of the relevant equipment, the terminal is fixed to the equipment body (such as the equipment housing) through the flange structure, and the main structure and the end are respectively used to electrically connect with the power supply unit of the equipment and the external equipment to realize the power supply connection between the equipment.

[0069] From the background technology, it can be seen that the flange structure is formed by stamping (extrusion) during the cold heading process. However, in the formation process of the above-mentioned flange structure, the workpiece material is located in the mold and is prone to offset during the material transfer process, resulting in uneven material distribution of the flange structure in the pre-forming state. In order to ensure the yield of the terminal, the blank needs to appropriately increase the amount of raw materials so that during the forming process of the terminal, the part with less flange structure material can also meet the corresponding process requirements. This results in a relatively large amount of excess material that needs to be cut off from the flange structure, thereby reducing material utilization and increasing material costs.

[0070] In view of this, the utility model provides a terminal cold heading forming module, which sets a preforming cavity in the first mold so that the workpiece material can be pre-deformed before the forming step of the above-mentioned flange structure, thereby solving the above-mentioned series of technical problems caused by uneven material distribution during the forming process of the flange structure.

[0071] Please refer to the attached Figure 1-Figure 3 The terminal cold heading forming module comprises a first die 10, and the first die 10 is used to obtain a preformed structure 71 located at one end of the workpiece material.

[0072] Specifically, the first mold 10 includes a first main mold 11 and a first punching die 12 , and the main mold and the punching die are used to cooperate with each other to complete the cold heading forming process of the workpiece material.

[0073] It is worth mentioning that in the above content, the main mold can be understood as the first main mold 11 in this embodiment, and can also be understood as one of the second main mold 21, the third main mold 31, the fourth main mold 41, the fifth main mold 51 and the sixth main mold 61 in the subsequent scheme; and the die can be understood as the first die 12 in this embodiment, and can also be understood as one of the second die 22, the third die 32, the fourth die 42, the fifth die 52 and the sixth die 62 in the subsequent scheme.

[0074] As described in the above embodiment, the first main die 11 and the first punch die 12 can reciprocate between positions close to each other and positions away from each other, so as to achieve the purpose of collaboratively completing the cold heading process.

[0075] In this embodiment, the first punch die 12 is configured to have the freedom to move toward and away from the first main die 11, so that the first main die 11 can be in a fixed state relative to the external environment to ensure the stability of the die cavity during the stamping and shaping process;

[0076] In other embodiments, the first mold 10 can also be configured so that the first main mold 11 has the freedom to move toward and away from the first punch 12, or the first main mold 11 and the first punch 12 both have the freedom to move toward and away from each other, and this embodiment does not impose strict restrictions on this. Of course, if each main mold in the module is configured to be fixed relative to the external environment, and each punch is configured to have the freedom to move toward and away from the main mold, the overall structural layout of the module will be more reasonable, and the process of transferring the workpiece material between the molds will also be more convenient, which is convenient for the overall layout design of the module.

[0077] It should be noted that in the terminal cold heading forming module, each main mold is the part of the mold used to fix and position the workpiece material so that the die can perform the next step of processing. It mainly includes the main mold sleeve (main mold shell) and the main mold core (main mold core), the main mold pad, the unloading rod and other components. A cavity is arranged in the main mold core, and the shape and size of this cavity determine the basic shape and size of the final molded part. The die is the part used to stamp and shape the workpiece material, which mainly includes the die sleeve (die shell), the die core (die core), the die pad, the punch rod and other components. The die sleeve is the main part 70 of the die, and a die core is arranged inside it for stamping the workpiece. During the cold heading forming process, the die stamps and shapes the workpiece through up and down reciprocating motion to achieve the desired shape and size.

[0078] Please continue to refer to the attached Figure 1-Figure 3In this embodiment, the first main mold 11 is provided with a preforming cavity 111 whose opening faces the first punch die 12. The size of the preforming cavity 111 close to the opening (located at the upper part of the first main mold 11 in the figure) gradually expands in the direction of the opening. The size of the preforming cavity 111 close to the opening gradually expands, which can provide a space for the workpiece material to deform outward at the end close to the opening of the preforming cavity 111. During the cold heading process, the workpiece material is placed in the preforming cavity 111 and is punched and shaped by the first punch die 12. The workpiece material is then deformed according to the preforming cavity 111. The structure undergoes corresponding deformation, and the material gradually flows to fill the deformation space provided by the preforming cavity 111. In this state, the end of the workpiece material away from the opening of the preforming cavity 111 is constrained by the body of the preforming cavity 111 (generally speaking, the outer diameter of the workpiece material will be selected to be compatible with the body of the preforming cavity 111), while the end of the workpiece material close to the opening of the preforming cavity 111 gradually changes shape due to the existence of its outward expansion structure, presenting a preforming structure 71 structure whose size gradually increases from the direction close to the body of the workpiece material to the direction away from the body of the workpiece material.

[0079] In the above-mentioned embodiment, since the structure of the pre-forming cavity 111 near the opening end is gradually enlarged, its outward expansion amplitude is not very large. Therefore, during the cold heading process, the deformation of the workpiece material is relatively small, thereby avoiding stress concentration and uneven material flow caused by excessive deformation of the workpiece material during the cold heading process. The material at the pre-forming structure 71 is evenly distributed, so that the subsequent forming of the flange structure 74 can be more regular, reducing or even avoiding the occurrence of material deviation, reducing the amount of raw materials used in the blank, and improving the material utilization rate of the terminal cold heading process, thereby reducing material costs.

[0080] It can be understood that the preforming process step is the initial forming stage in the cold heading process. Its main purpose is to process the raw materials into a workpiece with a specific preliminary shape, providing the basic shape and size for subsequent steps, making the material flow more uniform and the structure more regular.

[0081] The main reason for setting the end of the preform cavity 111 close to its opening as a gradually increasing expansion structure is to ensure that the workpiece material can enter the mold more easily and receive uniform force distribution in the mold in the subsequent process steps. Secondly, the design of gradually increasing size can also reduce the deformation resistance of the material during the stamping process, thereby improving production efficiency and product quality.

[0082] Furthermore, the first die 12 is provided with a first punch rod 121 extending toward the preforming cavity 111. When the first die 12 and the first main die 11 are in a position close to each other, the first punch rod 121 is inserted into the preforming cavity 111 through the opening of the preforming cavity 111, and when there is a workpiece material that has not undergone the preforming process step in the preforming cavity 111, the corresponding workpiece material is punched to achieve preforming of the workpiece material in the preforming cavity 111; and when the first die 12 and the first main die 11 are in a position far away from each other, the first punch rod 121 is separated from the preforming cavity 111, so as to avoid interference between the workpiece material and the first punch rod 121 during the process of entering and exiting the preforming cavity 111.

[0083] In one embodiment, the preforming mold cavity 111 is away from the opening end thereof, and the cavity bottom and cavity wall are connected by an arc transition, so that during the preforming process of the workpiece material, the bottom and the outer wall can be connected by the arc surface, thereby reducing the appearance difference at the bottom section of the workpiece.

[0084] It needs to be explained that, since the above content has already given corresponding explanations and illustrations of the general structure of the main mold and the punch die, and the matching relationship between the components in the main mold and the punch die is not the content that needs to be emphasized in the present invention, this article will not go into detail about the matching relationship between the components in the main mold and the punch die.

[0085] According to common knowledge in the field of mold technology, the cavity structure set on the main mold can be formed by the cooperation of the main mold core and the unloading rod, while the cavity structure set on the punch die can be formed by the cooperation of the punch die core and the punch rod.

[0086] Please continue to refer to the attached Figure 1-Figure 3 As a specific structural description of the preforming cavity 111 in the first main mold 11, the preforming cavity 111 includes a first shaping section 1111 and a first forming section 1112 connected in sequence. Figure 1-Figure 2In the provided first main mold 11 structure, the first shaping section 1111 and the first forming section 1112 are arranged in sequence from bottom to top. Among them, the first shaping section 1111 is located at the end of the preforming cavity 111 away from its opening, and is used to fix the workpiece material on the first main mold 11 and accurately position the workpiece material in the preforming cavity 111. In one embodiment, the inner cavity structure of the first shaping section 1111 can be set to adapt to the outer peripheral size of the workpiece material, so that the workpiece material does not need to produce too much deformation when it is located in the first shaping section 1111, and mainly provides the function of constraining positioning. It should be understood that the length dimension of the workpiece material is set to be greater than the length dimension of the first shaping section 1111, so that the part of the workpiece material that can extend from the first shaping section 1111 when it is located in the preforming cavity 111 can be acted upon by the first punch 121 and produce corresponding deformation. The first forming section 1112 is located at one end of the preforming cavity 111 close to its opening. The first forming section 1112 is connected to the first shaping section 1111. The setting direction of the two is consistent with the direction of relative movement of the first main mold 11 and the first punch 12, ensuring that the first punch 121 can be inserted into the preforming cavity 111. In addition, the first forming section 1112 gradually expands in size from one end close to the first shaping section 1111 toward the opening, thereby providing the above-mentioned corresponding deformation space for the workpiece material. During the cold heading process, part of the workpiece material extends into the first forming section 1112 through the first shaping section 1111, and the part of the workpiece material will be stamped by the first punch 121. In this way, the workpiece material in the first forming section 1112 will produce an outward expansion deformation along its radial direction, thereby forming part of the preforming structure 71.

[0087] It is understandable that the radial cross-sectional shape of the preforming cavity 111 can be structurally adaptively adjusted according to the design requirements and related requirements of the terminal product.

[0088] For example, Figure 3 As shown in , the radial cross-section of the workpiece material is waist-shaped (which can be understood as an oblong). Or in other embodiments, the radial cross-section of the workpiece material can also be set to be circular, elliptical, etc., and the radial cross-section of the preforming cavity 111 is adapted to different product requirements and is set to a corresponding structural shape.

[0089] Please refer to the attached Figure 4-Figure 5The terminal cold heading forming module also includes a second die 20. The first die 10 and the second die 20 are arranged in sequence to respectively undertake the stamping and shaping of the workpiece material in different process steps of the terminal. In the overall structure of the module, the process undertaken by the second die 20 is located after the process provided by the first die 10. After the workpiece material passes through the first die 10 for the preforming process step, the second die 20 provides the workpiece material with a secondary preforming process step. The secondary preforming is a subsequent step of the preforming, and the preliminarily formed material is further processed and corrected to make its shape, size and quality more in line with the design requirements and the material distribution is more uniform.

[0090] Similarly, the second mold 20 includes a second main mold 21 and a second punch mold 22, and the second main mold 21 and the second punch mold 22 can reciprocate between positions close to each other and positions away from each other to achieve secondary preforming of the workpiece material.

[0091] The second main mold 21 is provided with a first fixed mold cavity 211 opening toward the second punching die 22, and the opening direction of the first fixed mold cavity 211 is consistent with the axial direction of the workpiece material. Figure 4 As shown, the cavity wall of the first fixed mold cavity 211 is a side wall structure arranged in the vertical direction, so that the first fixed mold cavity 211 can play the function of constraining and positioning the workpiece material, and the bottom of the first fixed mold cavity 211 can be arranged according to the cavity bottom structure of the preforming mold cavity 111, so that the workpiece material can be further shaped at the bottom of the workpiece material during the secondary shaping process of the first fixed mold cavity 211 to make its structure more regular.

[0092] In one embodiment, the molding cavity can be formed by the cooperation of a die core disposed in the second die 22 and a second punch rod 221 .

[0093] During the cold heading process, the main part 70 of the workpiece material (hereinafter referred to as the main part 70 for ease of expression) is placed in the first fixed mold cavity 211 and cooperates with the first fixed mold cavity 211 so that the workpiece material can be fixed by the second main mold 21, while the preformed structure 71 is located outside the first fixed mold cavity 211 as a part for the second punch 22 to punch and produce further deformation.

[0094] Correspondingly, the second punch 22 is provided with a shaping cavity 222 opposite to the opening of the first fixed cavity 211, and the shaping cavity 222 is used to perform stamping and shaping on the preformed structure 71 portion extending from the first fixed cavity 211, so as to achieve the above-mentioned secondary preforming purpose. In this example, the cross-sectional shape of the shaping cavity 222 is rectangular, so that the preformed structure 71 can be upset into a relatively regular secondary shaping structure 72 under the secondary shaping of the shaping cavity 222, so that the material overflow is more uniform during the subsequent structure forming.

[0095] Specifically, on the basis that the opening of the shaping mold cavity 222 is arranged relative to the opening of the first fixed mold cavity 211, the bottom of the shaping mold cavity 222 is arranged relative to the bottom of the first fixed mold cavity 211 and is arranged horizontally. Similarly, the cavity wall of the shaping mold cavity 222 and the cavity wall of the first fixed mold cavity 211 are arranged in parallel, so that the workpiece material after being stamped and shaped by the second mold 20 forms a head with a roughly rectangular cross-sectional shape, while the tail remains in a structure that is approximately rod-shaped.

[0096] After the preforming step, since the preforming structure 71 has undergone a preliminary deformation relative to the main structure, the internal stress generated in the process of the preforming structure 71 being deformed to the secondary shaping structure 72 will be relatively small, thereby effectively reducing stress concentration and related problems such as poor flow and unevenness during the material extrusion process. The material can be formed more evenly and symmetrically under the extrusion of the mold, avoiding fracture due to excessive stress, mold explosion, and the need to pass more material to ensure subsequent processing requirements due to uneven material flow, thereby ensuring the product molding quality while saving material costs.

[0097] It should be understood that the radial dimension of the shaping cavity 222 is greater than the radial dimension of the preforming cavity 111. Exemplarily, in an embodiment where the preforming cavity 111 includes a first shaping section 1111 and a first molding section 1112, the length dimension of the shaping cavity 222 is set to be smaller than the length dimension of the first molding section 1112, while its radial dimension is greater than the radial dimension of the first molding section 1112. This allows the preforming structure 71 to be shortened in length and extended in the radial dimension direction during the process of deformation into the second shaping structure, so that the single deformation amount generated during the subsequent molding process of the flange structure 74 is smaller, thereby ensuring the molding quality.

[0098] It should be explained that the radial direction described in this embodiment can be understood as the direction of each cavity and the workpiece material perpendicular to its center line; and the longitudinal direction (axial direction) described in this embodiment can be understood as the direction of each cavity and the workpiece material parallel to its center line. Figure 4 The distance between the cavity walls on the left and right sides is greater than the distance between the left and right cavity walls of the first forming section 1112 in the figure, so that the preformed structure 71 can be further deformed and extended in the radial direction.

[0099] In one embodiment, the side wall of the shaping mold cavity 222 and its bottom wall can be connected by setting a chamfer to avoid a series of problems such as stress concentration of the workpiece material, poor material flow and increased mold wear during the cold heading process, thereby improving the product molding quality and effectively protecting the cold heading mold.

[0100] Please continue to refer to the attached Figure 4 In one embodiment, the cavity wall of the first fixed mold cavity 211 close to its opening end is set as an arc-shaped cavity wall, and the distance between any two opposite arc-shaped cavity walls gradually increases toward the opening direction of the first fixed mold cavity 211.

[0101] According to the structure of the first fixed die cavity 211 provided above, during the cold heading process, the preformed structure 71 will be squeezed toward the second main die 21 under the action of the second punch die 22. In this way, when the preformed structure 71 is shaped into the secondary shaping structure 72, the connection between the secondary shaping structure 72 and the main part 70 can form an arc surface connecting the two under the action of the arc cavity wall. Compared with the structure of the right-angle connection between the secondary shaping structure 72 and the main part 70, the arc surface connecting the secondary shaping structure 72 and the main part 70 can effectively avoid the situation of the mold bursting or damage caused by excessive impact force during the stamping process of the right-angle structure. At the same time, the arc surface can also reduce the friction between the main part 70 and the first fixed die cavity 211, making it easier for the workpiece material to escape from the first fixed die cavity 211.

[0102] Please refer to the attached Figure 6-Figure 7 The terminal cold heading forming module also includes a third die 30. The first die 10, the second die 20 and the third die 30 are arranged in sequence to respectively undertake the stamping and shaping of the workpiece material in different process steps of the terminal. In the overall structure of the module, the process undertaken by the third die 30 is located after the process provided by the second die 20. After the workpiece material passes through the second die 20 for the secondary shaping process step, the third die 30 provides the workpiece material with a flange forming process step. Flange forming is a subsequent step of the secondary shaping. The secondary shaping structure 72 is further processed and corrected to make its shape, size and quality more in line with the design requirements and close to the flange structure 74. At the same time, the distribution of the material there is also more uniform.

[0103] Similarly, the third die 30 includes a third main die 31 and a third punch die 32 , and the third main die 31 and the third punch die 32 can reciprocate between positions close to and away from each other to achieve flange forming of the workpiece material.

[0104] Among them, the third main mold 31 is provided with a second fixed mold cavity 311 opening toward the third punch die 32, and its structural function is similar to the above-mentioned first fixed mold cavity 211, both of which are used to constrain and fix the main body part 70. That is to say, when the workpiece material is fixed in the second fixed mold cavity 311 through its main body 70, the secondary shaping structure 72 is outside the second fixed mold cavity 311 for stamping and shaping by the third punch die 32.

[0105] When the third punch 32 and the third main die 31 are in a position close to each other, a flat extrusion space 33 is formed between the third punch 32 and the third main die 31, and the extrusion space 33 is connected to the second fixed die cavity 311. It can be understood that the dimension of the extrusion space 33 in the length direction is smaller than the dimension of the shaping die cavity 222 in the length direction. In this way, when the third punch 32 approaches the third main die 31 and stamps the secondary shaping structure 72, the secondary shaping structure 72 can further deform and extend radially, and finally stamp out the flange structure 73.

[0106] In one embodiment, the third punch die 32 is further provided with a contact cavity 322 for punching out an end point 76 on the secondary shaping structure 72 . The contact cavity 322 can be formed by the cooperation of the punch core of the third punch die 32 and the third punch rod 321 .

[0107] In addition, a converging section 75 is formed at the bottom of the second fixed mold cavity 311, and the outer diameter of the converging section 75 is smaller than the main part 70 of the second fixed mold cavity 311, and is used to squeeze the main part 70 of the workpiece material so that a structure is formed at the bottom of the workpiece material that is convenient for electrical connection with the corresponding unit, so as to facilitate the assembly of the terminal in actual application.

[0108] According to the technical solution provided by the third mold 30, since the secondary shaping structure 72 is roughly a rectangular structure, when it is further upset by the third main mold 31 and the third punch 32, the material flow of the secondary shaping structure 72 is more uniform, ensuring that the material distribution of the flange structure 73 is uniform, so as to improve the forming quality of the subsequent flange structure 74.

[0109] In the subsequent process steps, since the flange structure 74 has a bending structure 77, the flange structure 73 that has been initially flattened in the flange forming step can serve as a transition between the secondary shaping structure 72 and the flange structure 74, thereby avoiding the situation in which the flange bursts due to the large stress of stamping during the primary forming process, thereby improving the yield rate of the terminal product.

[0110] Through the stamping of the third die 30, the third die 30 can forge the workpiece material into a structure similar to a "T" shape, and the above-mentioned extrusion space 33 is not limited to a cavity by side wall constraints. In this way, the flange structure 73 can continuously extend radially outward according to its material residue, thereby reserving sufficient processing allowance for subsequent shaping steps.

[0111] From the above content, it can be seen that in the design of cold heading dies, the adjacent two side walls of the main die (and the punch die) are usually designed as a right angle (or nearly right angle) structure. However, this right angle design may have some disadvantages in some cases, mainly including the following points:

[0112] Stress concentration: Stress concentration is prone to occur at right-angle intersections. This is because the thickness or cross-sectional area of ​​the material changes suddenly at the right angle, causing stress to concentrate in this area when subjected to external force. This stress concentration may cause cracks, fractures or fatigue failure in the mold during use.

[0113] Poor material flow: During the metal plastic forming process, the right-angle design may cause the material to encounter resistance during the flow process, especially at the sharp corners where the right angles intersect, which may cause poor material flow and form folds, cracks or other forming defects.

[0114] Increased mold wear: Due to stress concentration and poor material flow, the mold part at the right-angle intersection may be subject to greater wear, which will not only reduce the service life of the mold, but also may affect the dimensional accuracy and surface quality of the formed part.

[0115] Processing difficulty and cost: Processing at right-angle intersections may require higher precision and more complex processes, resulting in increased mold manufacturing costs.

[0116] In order to alleviate these disadvantages, the main mold (and the punch die) can, but is not limited to, use rounded corners or chamfers instead of right-angle intersections to reduce stress concentration and poor material flow.

[0117] Please refer to the attached Figure 4-Figure 7 The cavity wall of the first fixed mold cavity 211 near its opening end is set as a first curved cavity wall 2111, and the first curved cavity wall 2111 is consistent with the curved cavity wall set in the first fixed mold cavity 211 mentioned above, and the distance between any two opposite first curved cavity walls 2111 gradually increases toward the opening direction of the first fixed mold cavity 211; and the cavity wall of the second fixed mold cavity 311 near its opening end is set as a second curved cavity wall 3111, and the distance between any two opposite second curved cavity walls 3111 gradually increases toward the opening direction of the second fixed mold cavity 311.

[0118] Based on the above-mentioned structures of the second mold 20 and the third mold 30, the curvature of the second arc-shaped cavity wall 3111 is greater than the curvature of the first arc-shaped cavity wall 2111, so that the curvature of the arc surface between the flange structure 73 and the main body 70 is larger, which is more conducive to alleviating corresponding problems such as stress concentration generated in subsequent process steps.

[0119] Please continue to refer to the attached Figure 6 Similarly, in the implementation manner of the third mold 30, one side of the third punch 32 used to form the extrusion space 33 is a plane to ensure that the upper surface of the flange structure 73 is flat. Of course, in the implementation manner in which the third punch 32 is provided with the above-mentioned contact cavity 322, the contact cavity 322 is opened on the above-mentioned plane.

[0120] Correspondingly, one side surface of the third main mold 31 used to form the extrusion space 33 is an arc surface, and the distance between the arc surface and the plane gradually increases from the direction close to the second fixed mold cavity 311 to the direction away from the second fixed mold cavity 311. In this way, the thickness of the end of the flange structure 73 close to the main part 70 is smaller than the thickness of the end away from the main part 70, and the thickness will gradually increase in the direction away from the main part 70. While ensuring that the flange structure 73 and the main part 70 are connected through the arc surface, the thinner thickness can facilitate the subsequent bending process of the flange structure 73, and the thicker thickness can reserve sufficient processing allowance for the regularity of the subsequent flange structure 74.

[0121] Please refer to the attached Figure 8-Figure 9 The terminal cold heading forming module also includes a fourth die 40. The first die 10, the second die 20, the third die 30 and the fourth die 40 are arranged in sequence to respectively undertake the stamping and shaping of the workpiece material in different process steps of the terminal. In the overall structure of the module, the process undertaken by the fourth die 40 is located after the process provided by the third die 30. After the workpiece material passes through the third die 30 for the flange forming process step, the fourth die 40 provides the workpiece material with a flange bending process step, so that the flange structure 73 is closer to the flange plate structure 74.

[0122] Similarly, the fourth die 40 includes a fourth main die 41 and a fourth punch die 42. The fourth main die 41 and the fourth punch die 42 can reciprocate between positions close to each other and positions away from each other to achieve flange bending of the workpiece material.

[0123] The fourth main mold 41 is provided with a third fixed mold cavity 411 opening toward the fourth punching die 42 , which has similar functions to the first fixed mold cavity 211 and the second fixed mold cavity 311 . The third fixed mold cavity 411 can be used to constrain and fix the main body 70 .

[0124] A first extrusion groove 412 is arranged around the opening of the third fixed mold cavity 411. When the fourth punch 42 is located close to the fourth main mold 41, the fourth punch 42 is at least partially located at the opening of the first extrusion groove 412, and together with the first extrusion groove 412, the flange structure 73 is constrained to ensure that the flange structure 73 remains relatively regular.

[0125] Compared with the flange structure 73 formed by the extrusion space 33 formed by the third punch 32 and the third main mold 31 of the third mold 30, since the first extrusion groove 412 is recessed on the fourth main mold 41, under the joint extrusion of the fourth main mold 41 and the fourth punch 42, the height position of at least part of the flange structure 73 will be lower than the height position of the flange structure 73 formed by the third mold 30, so as to facilitate the subsequent bending of the flange structure 73.

[0126] A first extrusion protrusion 413 is arranged around the third fixed mold cavity 411 (the opening) and the first extrusion groove 412. The first extrusion protrusion 413 protrudes from the bottom of the first extrusion groove 412 so that the end of the first extrusion protrusion 413 forms a step difference with the bottom of the first extrusion groove 412.

[0127] Relative to the third die 30, the position of the first extrusion protrusion 413 is exactly the position in the third die 30 where the distance between the arc surface and the plane is small (i.e., where the thickness of the flange structure 73 is small). During the process of the workpiece material moving from the third die 30 to the fourth die 40 for the next step of cold heading, the thinner thickness of the flange structure 73 can be controlled by the first extrusion protrusion 413, so that the end of the flange structure 73 close to the main part 70 is maintained at the current height, and under the joint action of the first extrusion groove 412 and the second extrusion groove 422, the end of the flange structure 73 away from the main part 70 is bent downward and deformed, finally forming the above-mentioned flange structure 74.

[0128] In order to further constrain the flange structure 73 during the bending process, the fourth die 42 is provided with a second extrusion groove 422. When the fourth die 42 is close to the fourth main die 41, the groove wall of the second extrusion groove 422 surrounds the outer periphery of the first extrusion protrusion 413 and is spaced apart from the first extrusion protrusion 413, so as to ensure that the flange structure 73 can be deformed and bent under the joint constraints of the groove wall and groove wall of the second extrusion groove 422, the first extrusion protrusion 413 and the groove bottom of the first extrusion groove 412, so as to finally form a flange structure 74 with its opening facing the fourth die 42.

[0129] It is understandable that the second extrusion groove 422 can be formed by the die core of the fourth die 42 and the fourth punch rod 421 .

[0130] It should be understood that, since sufficient processing allowance is reserved for the end of the flange structure 73 in the above-mentioned flange forming step, the flange edge at this time is still in a relatively large thickness state, reserving sufficient space for subsequent processing.

[0131] Please refer to the attached Figure 10-11 The terminal cold heading forming module also includes a fifth die 50. The first die 10, the second die 20, the third die 30, the fourth die 40 and the fifth die 50 are arranged in sequence. In the overall structure of the module, the process undertaken by the second die 20 is located after the process provided by the fourth die 40. After the workpiece material passes through the fourth die 40 for the flange bending process step, the fifth die 50 provides the workpiece material with a flange extrusion process step, so that the size of the flange structure 74 after extrusion is more in line with actual product requirements.

[0132] Similarly, the fifth die 50 includes a fifth main die 51 and a fifth punch die 52 . The fifth main die 51 and the fifth punch die 52 can reciprocate between positions close to each other and positions away from each other to achieve flange extrusion of the workpiece material.

[0133] The fifth main mold 51 is provided with a fourth fixed mold cavity 511 opening toward the fifth punching die 52, and a third extrusion groove 512 arranged around the opening of the fourth fixed mold cavity 511, and a second extrusion protrusion 513 is arranged around the fourth fixed mold cavity 511 and the third extrusion groove 512. When the fifth punching die 52 is in a position close to the fifth main mold 51, the groove wall of the fourth extrusion groove 522 surrounds the outer periphery of the second extrusion protrusion 513 and is spaced apart from the second extrusion protrusion 513.

[0134] The depth of the third extrusion groove 512 is less than the depth of the first extrusion groove 412, and the flange and various parts of the material workpiece are further regularized. During this process, the fifth die 52 (fourth extrusion groove 522) will cooperate with the third extrusion groove 512 to further extrude the edge of the flange structure 74, so that the thickness of the edge of the flange can be narrowed. At the same time, the edge of the flange structure 74 will also extend further outward under the above-mentioned extrusion, thereby providing sufficient margin for subsequent further regularization.

[0135] It can be understood that the third extrusion groove 512 of the fifth punch die 52 can be formed by the cooperation of the punch core of the fifth punch die 52 and the fifth punch rod 521 provided therewith.

[0136] Please refer to the attached Figure 12-13 The terminal cold heading forming module also includes a sixth die 60. The first die 10, the second die 20, the third die 30, the fourth die 40, the fifth die 50 and the sixth die 60 are arranged in sequence. In the overall structure of the module, the process undertaken by the sixth die 60 is located after the process provided by the fifth die 50. After the workpiece material passes through the fifth die 50 for the flange extrusion process step, the sixth die 60 provides the workpiece material with a flange trimming process step to complete the cold heading process of the entire terminal.

[0137] The sixth die 60 includes a sixth main die 61 and a sixth punch die 62 . The sixth main die 61 and the sixth punch die 62 can reciprocate between positions close to and away from each other to achieve flange trimming of the workpiece material.

[0138] The sixth main die 61 is provided with a fifth fixed die cavity 611 opening toward the sixth punching die 62 . The fifth fixed die cavity 611 is used to constrain and fix the workpiece material through the main body portion 70 of the terminal.

[0139] Correspondingly, the sixth main mold 61 is also provided with a trimming mold 622 which is arranged at intervals around the outer periphery of the fifth fixed mold cavity 611. It can be understood that the trimming mold 622 can be arranged on the sixth punch 621 provided on the sixth punch 62. When the workpiece material is constrained by the fifth fixed mold cavity 611 in the position of the sixth main mold 61, the sixth punch 62 cuts the edge of the flange structure 74 through the trimming mold 622, and regularizes the edge of the flange structure 74 to meet the size requirements of the terminal product.

[0140] To sum up, the terminal cold heading forming mold is mainly adjusted through the structure of the first mold 10, so that the workpiece material can be pre-formed in the corresponding cold heading forming process, so that the material distribution of the workpiece material in the deformation process is more uniform, so as to facilitate the subsequent further stamping and regularization, improve the product forming quality, improve the yield rate, and reduce material waste, reduce material and processing forming.

[0141] In the description of this article, it should be understood that the terms "upper", "lower", "left", "right", etc., and other directions or positional relationships are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0142] In the description of this specification, the description with reference to the terms "an embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0143] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0144] The technical principle of the present invention is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanations here, technicians in this field can think of other specific implementation methods of the present invention without creative work, and these methods will fall within the protection scope of the present invention.

Claims

1. A terminal cold heading forming module, characterized in that: include: A first mold (10), the first mold (10) comprising a first main mold (11) and a first punching mold (12), the first main mold (11) and the first punching mold (12) being capable of reciprocating between positions approaching each other and moving away from each other; The first main mold (11) is provided with a preforming mold cavity (111) whose opening faces the first punching die (12), and the size of the preforming mold cavity (111) gradually increases in the direction of the opening from one end close to the opening; The first punch die (12) is provided with a first punch rod (121) extending toward the preforming cavity (111); when the first punch die (12) and the first main die (11) are in a position close to each other, the first punch rod (121) is inserted into the preforming cavity (111) through the opening of the preforming cavity (111).

2. The terminal cold heading forming module according to claim 1, characterized in that: The preforming cavity (111) comprises: A first shaping section (1111) is located at an end of the preforming cavity (111) away from its opening; The first molding section (1112) is located at one end of the pre-molding cavity (111) close to its opening. The first molding section (1112) is connected to the first shaping section (1111), and the first molding section (1112) gradually expands in size from the end close to the first shaping section (1111) toward the opening.

3. The terminal cold heading forming module according to claim 1, characterized in that: Also includes: A second mold (20), wherein the first mold (10) and the second mold (20) are arranged in sequence, and the second mold (20) comprises a second main mold (21) and a second punching mold (22); The second main die (21) is provided with a first fixed die cavity (211) opening toward the second punch die (22); The second punching die (22) is provided with a shaping die cavity (222) opposite to the first fixed die cavity (211); the cross-sectional shape of the shaping die cavity (222) is rectangular, and the radial dimension of the shaping die cavity (222) is greater than the radial dimension of the preforming die cavity (111).

4. The terminal cold heading forming module according to claim 3, characterized in that: The cavity wall of the first fixed mold cavity (211) close to its opening end is configured as an arc-shaped cavity wall; and The distance between any two opposite arc-shaped cavity walls gradually increases toward the opening direction of the first fixed mold cavity (211).

5. The terminal cold heading forming module according to claim 3, characterized in that: Also includes: A third mold (30), wherein the first mold (10), the second mold (20) and the third mold (30) are arranged in sequence, and the third mold (30) comprises a third main mold (31) and a third punching die (32); The third main die (31) is provided with a second fixed die cavity (311) opening toward the third punch die (32); When the third punch die (32) and the third main die (31) are in a position close to each other, a flat extrusion space (33) is formed between the third punch die (32) and the third main die (31), and the extrusion space (33) is connected to the second fixed die cavity (311).

6. The terminal cold heading forming module according to claim 5, characterized in that: The cavity wall of the first fixed mold cavity (211) close to its opening end is set as a first arc-shaped cavity wall (2111), and the distance between any two opposite first arc-shaped cavity walls (2111) gradually increases towards the opening direction of the first fixed mold cavity (211); The cavity wall of the second fixed mold cavity (311) close to its opening end is configured as a second arc-shaped cavity wall (3111), and the distance between any two opposite second arc-shaped cavity walls (3111) gradually increases toward the opening direction of the second fixed mold cavity (311); and The curvature of the second curved cavity wall (3111) is greater than the curvature of the first curved cavity wall (2111).

7. The terminal cold heading forming module according to claim 5, characterized in that: The third punching die (32) is used to form a side surface of the extrusion space (33) which is a plane; One side surface of the third main mold (31) used to form the extrusion space (33) is an arc surface, and the distance between the arc surface and the plane gradually increases from the direction close to the second fixed mold cavity (311) to the direction away from the second fixed mold cavity (311).

8. The terminal cold heading forming module according to claim 5, characterized in that: Also includes: a fourth mold (40), wherein the first mold (10), the second mold (20), the third mold (30) and the fourth mold (40) are arranged in sequence, and the fourth mold (40) comprises a fourth main mold (41) and a fourth punching die (42); The fourth main die (41) is provided with a third fixed die cavity (411) opening toward the fourth punch die (42), and a first extrusion groove (412) arranged around the opening of the third fixed die cavity (411), and a first extrusion protrusion (413) is arranged around the third fixed die cavity (411) and the first extrusion groove (412); The fourth punch die (42) is provided with a second extrusion groove (422). When the fourth punch die (42) is in a position close to the fourth main die (41), the groove wall of the second extrusion groove (422) surrounds the outer periphery of the first extrusion protrusion (413) and is spaced apart from the first extrusion protrusion (413).

9. The terminal cold heading forming module according to claim 8, characterized in that: Also includes: a fifth mold (50), wherein the first mold (10), the second mold (20), the third mold (30), the fourth mold (40) and the fifth mold (50) are arranged in sequence, and the fifth mold (50) comprises a fifth main mold (51) and a fifth punching die (52); The fifth main die (51) is provided with a fourth fixed die cavity (511) opening toward the fifth punch die (52), and a third extrusion groove (512) arranged around the opening of the fourth fixed die cavity (511), and a second extrusion protrusion (513) is arranged around the fourth fixed die cavity (511) and the third extrusion groove (512); The depth of the third extrusion groove (512) is smaller than the depth of the first extrusion groove (412).

10. The terminal cold heading forming module according to claim 9, characterized in that: Also includes: a sixth mold (60), wherein the first mold (10), the second mold (20), the third mold (30), the fourth mold (40), the fifth mold (50) and the sixth mold (60) are arranged in sequence, and the sixth mold (60) comprises a sixth main mold (61) and a sixth punching die (62); The sixth main mold (61) is provided with a fifth fixed mold cavity (611) opening toward the sixth punching mold (62), and the sixth main mold (61) is also provided with a trimming mold (622) arranged at intervals around the outer periphery of the fifth fixed mold cavity (611).

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