Shell stamping die and stamping method

Abstract

The application provides a shell stamping die and a stamping method. The shell stamping die comprises a male die and a female die, the female die comprises a stamping cavity, the male die comprises a first die head and a second die head, the relative positions of the first die head and the second die head are adjustable along a stamping direction, the first die head and the second die head have a first relative position and a second relative position, the distance of the first relative position is smaller than the distance of the second relative position, during stamping, the first die head and the second die head are in the first relative position and jointly enter the stamping cavity to perform stamping, when the first die head reaches a preset position, the first die head remains stationary relative to the female die, and the second die head moves relative to the first die head to the second relative position. The shell stamping die can reduce internal stress during shell stamping, realize large-depth shell stamping forming, and improve the application range of the stamping process in shell manufacturing.

Description

Technical Field

[0001] This invention relates to the field of lithium-ion battery production technology, and more specifically, to a casing stamping die and stamping method. Background Technology

[0002] Lithium-ion batteries have high energy density and a wide operating temperature range, approximately -20℃ to 60℃. They exhibit excellent cycle performance, rapid charging and discharging, high charging efficiency, high output power, and long service life. They also do not contain toxic or harmful substances, and their cell materials can be recycled, thus earning them the title of "green batteries."

[0003] Lithium-ion batteries include a battery casing, which is currently generally made of aluminum and manufactured through stamping. Existing aluminum casing stamping and stretching technology involves single-sided extrusion of aluminum material, causing plastic deformation to form the final casing shape. This method results in a relatively shallow casing and requires strict control over the wall thickness variation. Excessive wall thickness variation can easily cause the aluminum material to break during stamping, making it difficult to achieve the desired casing shape. Figure 1 As shown, the stamping die for the battery casing includes a male die 1' and a female die 2'. The aluminum shell 3' is stamped and stretched in the stamping cavity of the female die 2' through the male die 1'. The aluminum sheet is stamped into the shape of an aluminum shell through a series of progressive dies. There is no relative displacement between the inner wall of the aluminum shell and the male die 1'. Only the female die 2', located outside the aluminum shell 3', squeezes the aluminum material through the set gap with the male die 1', reducing the thickness of the aluminum material and causing plastic deformation, thereby forming an aluminum shell product with a certain wall thickness and depth.

[0004] When aluminum shells are manufactured in this way, the internal stress is large due to the large difference in wall thickness before and after stamping and stretching when the aluminum material is displaced and deformed. Therefore, when the depth of the aluminum shell reaches a certain level, it is easy for it to break at the opening, which limits the manufacturing length of the aluminum shell, increases the requirements for wall thickness and wall thickness difference, and limits the application range of stamping technology in the manufacture of lithium battery aluminum shells. Summary of the Invention

[0005] The main objective of this invention is to provide a shell stamping die and a stamping method that can reduce the internal stress during the shell stamping process, achieve deep shell stamping, and improve the applicability of stamping technology in shell manufacturing.

[0006] To achieve the above objectives, according to one aspect of the present invention, a housing stamping die is provided, comprising a male die and a female die, the female die including a stamping cavity, and the male die including a first die head and a second die head. Along the stamping direction, the relative positions of the first die head and the second die head are adjustable. The first die head and the second die head have a first relative position and a second relative position, the distance between the first relative positions being less than the distance between the second relative positions. During stamping, the first die head and the second die head are in the first relative position and enter the stamping cavity together for stamping. When the first die head reaches a preset position, the first die head remains stationary relative to the female die, and the second die head moves to the second relative position relative to the first die head.

[0007] Furthermore, the cross-sections of the opposite sides of the first and second mold heads are identical.

[0008] Furthermore, the edge of the first mold head away from the second mold head is a first arc surface, which extends circumferentially along the first mold head; the edge of the second mold head away from the first mold head is a second arc surface, which extends circumferentially along the second mold head.

[0009] Furthermore, the die has a third arc surface at the entrance of the stamping cavity. The third arc surface extends circumferentially along the die, and the ratio between the radius R1 of the first arc surface and the radius R3 of the third arc surface is in the range of R1 / R3 = 0.8 to 1.2.

[0010] Furthermore, R1 = R3.

[0011] Furthermore, the ratio between the radius R2 of the second arc surface and the radius R3 of the third arc surface ranges from R2 / R3 = 0.8 to 1.2.

[0012] Furthermore, a push rod is provided on the side of the second mold head facing the first mold head. The push rod is fixedly connected to the second mold head, passes through the first mold head, and slides in cooperation with the first mold head.

[0013] Furthermore, the housing stamping die also includes a stamping machine, which includes a first stamping machine platform and a second stamping machine platform. The first stamping machine platform is fixedly connected to the first die head, and the second stamping machine platform is located on the side of the first stamping machine platform away from the second die head and is fixedly connected to the ejector pin. The relative positions of the first stamping machine platform and the second stamping machine platform along the stamping direction are adjustable.

[0014] Furthermore, the ejector pin is detachably connected to the second die head and / or the second stamping press.

[0015] Furthermore, the housing stamping die also includes a stamping machine, which includes a stamping machine platform. The stamping machine platform is fixedly connected to the first die head, the first end of the ejector rod is rotatably connected to the second die head, the second end of the ejector rod is threadedly connected to the stamping machine platform, and the portion of the ejector rod that passes through the first die head is threadedly engaged with the first die head.

[0016] According to another aspect of the present invention, a stamping method for the above-described housing stamping die is provided, comprising:

[0017] Position the first mold head and the second mold head in a first relative position;

[0018] Control the first and second dies to stamp synchronously;

[0019] When the first die head presses to the preset position of the female die, the first die head is controlled to remain stationary relative to the position of the female die, and the second die head is controlled to continue pressing;

[0020] When the second die head reaches the second relative position with respect to the first die head, the movement of the second die head stops, and the stamping is completed.

[0021] According to the technical solution of the present invention, the shell stamping die includes a male die and a female die. The female die includes a stamping cavity, and the male die includes a first die head and a second die head. Along the stamping direction, the relative positions of the first die head and the second die head are adjustable. The first die head and the second die head have a first relative position and a second relative position. The distance between the first relative positions is less than the distance between the second relative positions. During stamping, the first die head and the second die head are in the first relative position and enter the stamping cavity together for stamping. When the first die head reaches the preset position, the first die head remains stationary relative to the female die, and the second die head moves to the second relative position relative to the first die head. This shell stamping die features a split-structure male die, consisting of a first die head and a second die head. The relative positions of the first and second die heads are adjustable. During the stamping process, the first and second die heads move synchronously. After the first die head reaches a specified stroke, it stops, and the stamping machine continues to push the second die head downwards, stretching the shell to the required depth. As the second die head continues to stamp, relative displacement occurs between the first die head and the inner wall of the shell, and between the female die and the outer wall of the shell. The shell wall thickness is simultaneously compressed from both the inner and outer walls to the required thickness, releasing the internal stress during the stamping process. This significantly increases the stamping and stretching depth of the shell, expanding the applicability of the stamping process in shell manufacturing. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0023] Figure 1 A stamping structure diagram of a housing stamping die of the related technology is shown;

[0024] Figure 2 A stamping structure diagram of a housing stamping die according to an embodiment of the present invention is shown;

[0025] Figure 3 A perspective structural diagram of a housing stamping die according to an embodiment of the present invention is shown;

[0026] Figure 4 A front view structural diagram of a housing stamping die according to an embodiment of the present invention is shown;

[0027] Figure 5 A side view of the housing stamping die according to an embodiment of the present invention is shown;

[0028] Figure 6 A top view of the housing stamping die according to an embodiment of the present invention is shown; and

[0029] Figure 7 A three-dimensional structural schematic diagram of a housing stamping die according to an embodiment of the present invention is shown.

[0030] The above figures include the following reference numerals:

[0031] 1. Male mold; 2. Female mold; 3. First mold head; 4. Second mold head; 5. First arc surface; 6. Second arc surface; 7. Third arc surface; 8. Ejector pin; 9. Press; 10. Housing. Detailed Implementation

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] See also Figures 2 to 7 As shown, the present invention provides a shell stamping die, including a male die 1 and a female die 2. The female die 2 includes a stamping cavity. The male die 1 includes a first die head 3 and a second die head 4. Along the stamping direction, the relative positions of the first die head 3 and the second die head 4 are adjustable. The first die head 3 and the second die head 4 have a first relative position and a second relative position. The distance between the first relative positions is less than the distance between the second relative positions. During stamping, the first die head 3 and the second die head 4 are in the first relative position and enter the stamping cavity together for stamping. When the first die head 3 reaches a preset position, the first die head 3 remains stationary relative to the female die 2, and the second die head 4 moves to the second relative position relative to the first die head 3.

[0034] The housing stamping die is designed with a split structure for the male mold 1, which is divided into a first mold head 3 and a second mold head 4. The relative positions of the first mold head 3 and the second mold head 4 are adjustable. During the housing stamping process, the first mold head 3 and the second mold head 4 move synchronously and stamp the housing 10 at the same time. After the first mold head 3 moves to the specified stroke, it stops. The stamping machine continues to push the second mold head 4 downward to stretch the housing 10 to the required depth. During the stamping process of the second mold head 4, relative displacement occurs between the first mold head 3 and the inner wall of the housing 10, and between the female mold 2 and the outer wall of the housing 10. The housing is squeezed from both the inner and outer walls of the housing 10 at the same time, so that the housing wall thickness is squeezed to the required wall thickness.

[0035] During the stamping process performed independently by the second die head 4, the shell 10 is subjected to the stamping action of the second die head 4. The un-extruded portion simultaneously enters the extrusion space between the first die head 3 and the female die 2 under the extrusion action of the first die head 3 and the female die 2. During this process, the shell tilts towards the side where the first die head 3 is located under the extrusion action of the female die 2, so that the outer wall of the shell is extruded by the female die 2, and the inner wall of the shell is extruded by the first die head 3. The difference in wall thickness between the shell before extrusion and the wall thickness after extrusion is distributed to the side where the female die 2 is located and the side where the first die head 3 is located. Therefore, a part of the shell 10 is subjected to the extrusion force of the female die 2, and a part of the shell 10 is subjected to the extrusion force of the first die head 3. The shell wall thickness to be extruded by the female die 2 is significantly reduced, and the extrusion force and stress generated by the female die 2 during the extrusion process are significantly reduced. The first die head 3 bears part of the extrusion action of the shell 10. The extrusion force applied is less than that applied when using the die 2 alone. Both the die 2 and the first die 3 only need to bear part of the extrusion force of the shell during the stamping process. This makes the extrusion force on the inner and outer sides of the shell more balanced, significantly reducing the resistance and unilateral deformation. Therefore, it is less likely to break during the stamping process, improving the stability of the stamping process. At the same time, the simultaneous extrusion from both sides of the shell 10 by the die 2 and the first die 3 makes the force on both sides of the shell more balanced. The reaction force on one side of the shell is weakened, and the internal stress during the stamping process is released. This can significantly increase the depth of the stamping and stretching of the shell, and expand the applicability of the stamping process in shell manufacturing. In addition, since the resistance of the shell 10 during the stamping process is significantly reduced, the stamping speed is significantly increased, and the stamping efficiency is significantly improved.

[0036] Furthermore, since the master mold 2 and the first die head 3 simultaneously extrude the shell 10 from both sides, the single-sided wall thickness difference is significantly reduced, and the overall wall thickness difference of the shell 10 during the stamping process can be significantly increased. This can greatly increase the allowable wall thickness difference during the stamping process of the shell 10, effectively improve the stamping depth of the shell 10, and enable the stamping forming of shell 10 with thinner wall thickness.

[0037] Taking stamped aluminum shells as an example, in related technologies, the current limit for the wall thickness difference of stamped aluminum shells is 0.4 mm. Therefore, this imposes significant limitations on the preparation of aluminum shells with large wall thickness differences, resulting in low applicability. After adopting the shell stamping die of the embodiment of this invention, the limit for the wall thickness difference of aluminum shells can be increased to 0.4*2=0.8 mm. Compared with related technologies, the wall thickness difference can be doubled, thus significantly increasing the allowable wall thickness difference during the aluminum shell stamping process.

[0038] In this embodiment, the first relative position refers to the position where the first die head 3 and the second die head 4 are in contact, forming an integral structure for stamping. In this case, stamping is primarily performed by the second die head 4, and the function of the first die head 3 is to cooperate with the second die head 4 to ensure the consistency of the stamped shell wall thickness. The first die head 3 enters the stamping cavity of the mother die 2 along with the stamping action of the second die head 4. The second relative position refers to the relative position of the first die head 3 and the second die head 4 after they separate and the second die head 4 reaches the target stamping position. The second relative position can be determined based on the required depth and wall thickness of the shell to be stamped. When the second die head 4 reaches the target stamping position, the stamping of the shell is completed, and a stamped shell of the required size and specifications can be obtained.

[0039] The preset position refers to the position where the first die head 3 is fully or mostly inside the stamping cavity of the mother die 2, and can work together with the mother die 2 to press the inner and outer walls of the shell. The preset position can be set as needed. In one embodiment, the preset position refers to the position where the first die head 3 is completely located inside the stamping cavity of the mother die 2, and the top surface of the first die head 3 is flush with the top surface of the mother die 2.

[0040] In one embodiment, the cross-sections of opposite sides of the first die 3 and the second die 4 are identical. In this embodiment, the cross-sections of the main bodies of the first die 3 and the second die 4 are rectangular, and the cross-sections of the main bodies of the first die 3 and the second die 4 are exactly the same, thereby enabling the formation of a precise stamped structure during the stamping process.

[0041] The cross-sections of the main bodies of the first die head 3 and the second die head 4 are exactly the same. After the first die head 3 and the second die head 4 separate, during the stamping process of the second die head 4, the lateral deformation of the stamping shell between the first die head 3 and the second die head 4 is avoided, which would lead to unevenness of the inner wall of the stamping shell and improve the quality of the stamping shell.

[0042] In one embodiment, the edge of the first mold head 3 on the side away from the second mold head 4 is a first arc surface 5, which extends circumferentially along the first mold head 3, and the edge of the second mold head 4 on the side away from the first mold head 3 is a second arc surface 6, which extends circumferentially along the second mold head 4.

[0043] In this embodiment, the side of the first die head 3 away from the second die head 4 is the feeding side of the housing during stamping. The edge of the first die head 3 on the side of the housing feeding side is set as a first arc surface 5, so that the top peripheral edges of the first die head 3 are all arc surfaces, which can form an arc-shaped guide surface on the outer peripheral side of the first die head 3. The first arc surface 5 extending circumferentially at the top of the first die head 3 can guide the housing during the extrusion of the housing into the stamping cavity, reduce the resistance of the housing entering the stamping cavity, and at the same time, the first arc surface 5 can improve the stress generated by the housing being extruded by the first die head 3 when entering the stamping cavity, avoid excessive stress concentration, avoid large resistance to the stretching of the housing, and effectively avoid the problem of the housing breaking during the stretching process due to excessive stress.

[0044] The side of the second die head 4 furthest from the first die head 3 is the stamping side of the second die head 4. The edge of the stamping side of the second die head 4 is set as the second arc surface 6. This means that all the edges of the stamping side of the second die head 4 are rounded to form the second arc surface 6. The second arc surface 6 extends circumferentially, so that the entire edge position of the stamping side of the second die head 4 forms an arc surface. In this way, during the stamping and stretching process of the second die head 4, stress concentration problems that could lead to the breaking of the shell can be effectively avoided, thus providing effective protection for the shell stamping and improving the stamping quality and stamping reliability.

[0045] In one embodiment, the die 2 has a third arc surface 7 at the entrance of the stamping cavity. The third arc surface 7 extends circumferentially along the die 2, and the ratio between the radius R1 of the first arc surface 5 and the radius R3 of the third arc surface 7 is in the range of R1 / R3 = 0.8 to 1.2.

[0046] In this embodiment, the female mold 2 has a second arc surface 6 at the entrance of the stamping cavity. On the one hand, this prevents the shell 10 from breaking due to excessive stress concentration during the stamping process. On the other hand, it facilitates the stamping of the first die head 3 and the second die head 4 into the female mold 2. The inner dimensions of the female mold 2 and the outer dimensions of the male mold 1 together determine the wall thickness of the shell. The second arc surface 6 can effectively protect the shell entering the stamping cavity, effectively improve the stress concentration phenomenon, avoid the shell cracking problem caused by stress concentration, and improve the shell forming quality.

[0047] The third arc surface 7 of the female mold 2 is located on the outer periphery, and the first arc surface 5 of the first mold head 3 is located on the inner periphery. The shell 10 is located between the first arc surface 5 and the third arc surface 7. The radii of the first arc surface 5 and the third arc surface 7 determine the stress distribution ratio between the inner and outer walls of the shell 10. When the radius of the first arc surface 5 is large, the wall thickness of the shell 10 is more concentrated on the outer side and is borne by the third arc surface 7 of the female mold 2. At this time, the stress generated on the outer wall of the shell 10 during the extrusion process is greater than the stress generated on the inner wall of the shell 10 during the extrusion process. The maximum allowable wall thickness of the shell 10 is determined by the wall thickness difference of the outer wall of the shell 10. When the radius of the first arc surface 5 is small, the wall thickness of the shell 10 is more concentrated on the inner side and is borne by the third arc surface 7 of the female mold 2. The first arc surface 5 of the first die head 3 bears the stress. At this time, the stress generated by the inner wall of the shell 10 during the extrusion process is greater than the stress generated by the outer wall of the shell 10 during the extrusion process. The maximum allowable wall thickness of the shell 10 is determined by the wall thickness difference of the inner wall of the shell 10. When the radius of the first arc surface 5 is the same as the radius of the third arc surface 7, the wall thickness of the shell 10 is evenly distributed on the inner and outer sides of the shell, and is borne by the first arc surface 5 of the first die head 3 and the third arc surface 7 of the female die 2, respectively. At this time, the stress generated by the inner wall of the shell 10 during the extrusion process is equal to the stress generated by the outer wall of the shell 10 during the extrusion process. The maximum allowable wall thickness of the shell 10 is determined by the wall thickness difference between the inner and outer walls of the shell 10. The wall thickness difference is the largest under this condition.

[0048] In one embodiment, R1 = R3.

[0049] In one embodiment, the ratio between the radius R2 of the second arc surface 6 and the radius R3 of the third arc surface 7 is in the range of R2 / R3 = 0.8 to 1.2.

[0050] By defining the relationship between the radius of the second arc surface 6 and the radius of the third arc surface 7, the radius of the second arc surface 6 can be reasonably set, thereby achieving a better stamping and stretching effect, reducing stress concentration, dispersing stress, and avoiding cracks or fractures in the shell caused by local stress concentration.

[0051] In one embodiment, a push rod 8 is provided on the side of the second mold head 4 facing the first mold head 3. The push rod 8 is fixedly connected to the second mold head 4, passes through the first mold head 3, and slides with the first mold head 3.

[0052] In this embodiment, by setting a push rod 8 on the second mold head 4 and making the first mold head 3 slide on the push rod 8, it is possible to achieve synchronous movement of the first mold head 3 and the second mold head 4 for stamping, and also to use the push rod 8 to apply force to the second mold head 4 independently. At this time, since the first mold head 3 can slide relative to the push rod 8, the force of the push rod 8 will not be applied to the first mold head 3, but only to the second mold head 4. Therefore, the first mold head 3 can remain in its original position, while the second mold head 4 can continue to rise under the action of the push rod 8, thus realizing the separation between the first mold head 3 and the second mold head 4.

[0053] In one embodiment, the housing stamping die further includes a stamping machine 9, which includes a first stamping machine platform and a second stamping machine platform. The first stamping machine platform is fixedly connected to the first die head 3, and the second stamping machine platform is located on the side of the first stamping machine platform away from the second die head 4 and is fixedly connected to the ejector rod 8. The relative positions of the first stamping machine platform and the second stamping machine platform along the stamping direction are adjustable.

[0054] In this embodiment, the stamping machine 9 has two stamping platforms that can move synchronously and relative to each other. During stamping, before the first die 3 reaches the preset position, the first and second stamping platforms move synchronously. At this time, the first die 3 moves with the first stamping platform, and the second die 4 moves with the second stamping platform. The first die 3 and the second die 4 stamp synchronously. After the first die 3 reaches the preset position, the first stamping platform stops moving, while the second stamping platform continues to move. The first die 3, connected to the first stamping platform, stops moving and cooperates with the female die 2 to extrude the shell. The second die 4, connected to the second stamping platform, continues to move and stamp. By utilizing the relative movement of the first and second stamping platforms, the separation of the first die 3 and the second die 4 can be easily achieved, while ensuring that the second die 4 can continue stamping.

[0055] In this embodiment, the ejector rod 8 passes through the first stamping press and is slidably connected to it, so that the movement of the ejector rod 8 is independent of and unaffected by the first stamping press. Since the ejector rod 8 is fixedly connected to the second stamping press, when the second stamping press continues to move downward, the ejector rod 8 can drive the second die head 4 to continue moving for stamping.

[0056] In one embodiment, the ejector pin 8 is detachably connected to the second die head 4 and / or the second press machine, which facilitates the installation and removal of the ejector pin 8 from the second die head 4 and / or the second press machine, and also facilitates the installation and removal of the ejector pin 8 from the first die head 3 and the first press machine.

[0057] In one embodiment, the ejector pin 8 is, for example, a round pin, a square pin, or a rod-shaped structure of other shapes. The shape of the through hole on the first die head 3 and the first stamping machine is adapted to the cross-sectional shape of the ejector pin 8, which facilitates the installation of the ejector pin 8 on the first die head 3 and the first stamping machine.

[0058] In one embodiment, the push rod 8 can be welded at one end to the second stamping machine platform and screwed or snapped to the second die head 4 at the other end; or it can be welded at one end to the second die head 4 and screwed or snapped to the second stamping machine platform at the other end; or it can be screwed or snapped to the second die head 4 at one end and screwed or snapped to the second stamping machine platform at the other end.

[0059] In one embodiment, the housing stamping die further includes a stamping machine 9, which includes a stamping machine platform. The stamping machine platform is fixedly connected to the first die head 3, the first end of the ejector rod 8 is rotatably connected to the second die head 4, the second end of the ejector rod 8 is threadedly connected to the stamping machine platform, and the portion of the ejector rod 8 that passes through the first die head 3 is threadedly engaged with the first die head 3.

[0060] In this embodiment, there is one stamping machine, which is fixedly connected to the first die head 3. One end of the ejector rod 8 is only rotatably connected to the second die head 4 without axial displacement. The other end of the ejector rod 8 passes through the first die head 3 and the stamping machine and is connected to the drive mechanism. The drive mechanism drives the ejector rod 8 to rotate, so that the ejector rod 8 rotates helically relative to the first die head 3 and the stamping machine. The helical rotation generates axial thrust, so that the second die head 4 continues to stamp.

[0061] In one embodiment, the stamping cavity of the female mold 2 may or may not penetrate the female mold 2. When the stamping cavity penetrates the female mold 2, the radius of the second arc surface 6 is greater than the radius of the second arc surface 6 when the stamping cavity does not penetrate the female mold 2.

[0062] According to an embodiment of the present invention, the stamping method of the above-mentioned housing stamping die includes:

[0063] Position the first mold head 3 and the second mold head 4 in a first relative position;

[0064] Control the first die head 3 and the second die head 4 to stamp synchronously;

[0065] When the first die head 3 presses to the preset position of the female die 2, the first die head 3 is controlled to remain stationary relative to the female die 2, and the second die head 4 is controlled to continue pressing.

[0066] When the second die head 4 reaches the second relative position with respect to the first die head 3, the movement of the second die head 4 is stopped, and the stamping is completed.

[0067] In the above-described stamping method, during stamping, the first die 3 and the second die 4 move synchronously and simultaneously stamp the housing 10. After the first die 3 moves to the specified stroke, it stops. The stamping machine continues to push the second die 4 downward, stretching the housing 10 to the required depth. During the stamping process of the second die 4, relative displacement occurs between the first die 3 and the inner wall of the housing 10, and between the female die 2 and the outer wall of the housing 10. The housing is simultaneously squeezed from the inner and outer walls of the housing 10, so that the housing wall thickness is squeezed to the required wall thickness.

[0068] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0069] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0070] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A shell stamping die, characterized in that, The mold includes a male mold (1) and a female mold (2). The female mold (2) includes a stamping cavity. The male mold (1) includes a first die head (3) and a second die head (4). Along the stamping direction, the relative positions of the first die head (3) and the second die head (4) are adjustable. The first die head (3) and the second die head (4) have a first relative position and a second relative position. The distance between the first relative positions is less than the distance between the second relative positions. During stamping, the first die head (3) and the second die head (4) are in the first relative position and enter the stamping cavity together for stamping. When the first die head (3) reaches the preset position, the first die head (3) remains stationary relative to the female mold (2), and the second die head (4) moves to the second relative position relative to the first die head (3). The cross-sections of the opposite sides of the first die head (3) and the second die head (4) are the same.

2. The housing stamping die according to claim 1, characterized in that, The edge of the first mold head (3) away from the second mold head (4) is a first arc surface (5), which extends circumferentially along the first mold head (3). The edge of the second mold head (4) away from the first mold head (3) is a second arc surface (6), which extends circumferentially along the second mold head (4).

3. The housing stamping die according to claim 2, characterized in that, The master die (2) has a third arc surface (7) at the entrance of the stamping cavity. The third arc surface (7) extends circumferentially along the master die (2). The ratio between the radius R1 of the first arc surface (5) and the radius R3 of the third arc surface (7) is in the range of R1 / R3 = 0.8~1.

2.

4. The housing stamping die according to claim 3, characterized in that, R1=R3.

5. The housing stamping die according to claim 3, characterized in that, The ratio between the radius R2 of the second arc surface (6) and the radius R3 of the third arc surface (7) is in the range of R2 / R3 = 0.8~1.

2.

6. The housing stamping die according to any one of claims 1 to 5, characterized in that, The second mold head (4) is provided with a push rod (8) on the side facing the first mold head (3). The push rod (8) is fixedly connected to the second mold head (4). The push rod (8) passes through the first mold head (3) and slides with the first mold head (3).

7. The housing stamping die according to claim 6, characterized in that, The housing stamping die also includes a stamping machine (9), which includes a first stamping machine platform and a second stamping machine platform. The first stamping machine platform is fixedly connected to the first die head (3), and the second stamping machine platform is located on the side of the first stamping machine platform away from the second die head (4) and is fixedly connected to the ejector rod (8). The relative positions of the first stamping machine platform and the second stamping machine platform along the stamping direction are adjustable.

8. The housing stamping die according to claim 7, characterized in that, The push rod (8) is detachably connected to the second die head (4) and / or the second stamping machine.

9. The housing stamping die according to claim 6, characterized in that, The housing stamping die also includes a stamping machine (9), the stamping machine (9) includes a stamping machine platform, the stamping machine platform is fixedly connected to the first die head (3), the first end of the ejector rod (8) is rotatably connected to the second die head (4), the second end of the ejector rod (8) is threadedly connected to the stamping machine platform, and the part of the ejector rod (8) that passes through the first die head (3) is threadedly engaged with the first die head (3).

10. A stamping method for a housing stamping die as described in any one of claims 1 to 9, characterized in that, include: Position the first mold head (3) and the second mold head (4) in a first relative position; Control the first die head (3) and the second die head (4) to stamp synchronously; When the first die head (3) presses to the preset position of the female die (2), the first die head (3) is controlled to remain stationary relative to the female die (2), and the second die head (4) is controlled to continue pressing; When the second die head (4) moves to the second relative position relative to the first die head (3), the movement of the second die head (4) is stopped, and the stamping is completed.

Images