A forming process for an integrated top cover sheet of an explosion-proof valve

Abstract

The present invention proposes a forming process for an explosion-proof valve integrated top cover sheet. In step 2, multiple empty grooves and the shape of the top cover sheet are processed by the first trimming. In step 3, the top of the top cover sheet is pressed against the top first, and the pre-pier punch is pressed down again, and the residual material can only go to the empty groove processed in step 2. In step 4, the multiple empty grooves are finely punched, and the residual material going to the empty groove in step 3 is flushed away, thereby avoiding the excess material from surging upward and also avoiding the collision phenomenon in subsequent processing; in step 5, the convex hull structure is finely processed, and the depth of the convex hull structure is deepened from h1 to h2, so that the material flow of the convex hull structure is smoother, so as to improve the stability and flatness of the convex hull structure, and also prevent the material from surging upward again during the fine processing of the explosion-proof valve; in step 6, the processing of the notch will no longer be affected by the material flow during other processing steps of the explosion-proof valve. During processing, the excess material formed by pressing the notch can go to the avoidance position, thereby ensuring the stability of the notch.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy batteries, and in particular to a forming process for an explosion-proof valve integrated top cover sheet. Background Art

[0002] The top cover of new energy batteries is equipped with an explosion-proof valve to prevent the internal gas of the battery from expanding and causing explosion when overpressure or abnormal temperature occurs. The explosion-proof valve usually includes structures such as a spring, a valve body and a sealing ring, which can automatically open under a specific pressure to release gas, thereby protecting the safety of the battery and the surrounding environment.

[0003] The existing top cover sheet only has an assembly groove for the explosion-proof valve, and the explosion-proof valve is produced separately and connected to the top cover sheet by welding; the applicant filed an invention patent in 2022, an integrated molding process of the top cover sheet and the explosion-proof valve (CN115377574B), the technical solution of which reduces the manufacturing process of new energy batteries and reduces the manufacturing cost; however, in the process of implementing the aforementioned invention, the following problems still exist:

[0004] (1) When the explosion-proof valve is formed, the punch is pressed down to form a concave step on the front of the material strip and a convex hull on the back of the material strip. However, the concave step material is more than the convex hull material. The excess material has nowhere to go and will surge upward, resulting in collision in subsequent processing;

[0005] (2) The convex structure of the explosion-proof valve is difficult to move and has high pressure during molding, making it difficult to ensure stability and flatness;

[0006] (3) The size of the notch on the explosion-proof valve is small, and it is easily affected by the material flow during other processing steps, so stability is difficult to achieve. Summary of the invention

[0007] The problem to be solved by the present invention is to provide a forming process for an integrated top cover sheet for explosion-proof valves, which can avoid collision and gushing of materials when the top cover sheet and the explosion-proof valve are integrally formed, and has good stability and flatness of the convex structure of the explosion-proof valve and good stability of the notch of the explosion-proof valve.

[0008] The technical solution adopted by the present invention to solve the above problems is: a forming process of an explosion-proof valve integrated top cover sheet, including a stamping device, the stamping device including a first trimming station, an explosion-proof valve pre-processing station, a second trimming station, an explosion-proof valve finishing station, an explosion-proof valve notching station and a blanking station; the explosion-proof valve pre-processing station is provided with an explosion-proof valve pre-processing mold; the explosion-proof valve pre-processing mold includes a pre-pier punch and a reverse top; the explosion-proof valve notching station is provided with an explosion-proof valve notching processing mold; the explosion-proof valve notching processing mold includes an explosion-proof valve notching punch; the explosion-proof valve notching punch has an avoidance position;

[0009] The molding process includes the following steps:

[0010] Step 1: Loading: Take the material belt and feed it into the stamping equipment, so that the material belt can be continuously fed forward on the stamping equipment;

[0011] Step 2, first trimming: When the material strip is fed to the first trimming station, the first trimming mold is pressed down to pre-punch multiple empty grooves on the material strip, and the interior of the multiple empty grooves is surrounded by a top cover sheet;

[0012] Step 3, explosion-proof valve pre-processing: when the material strip is fed to the explosion-proof valve pre-processing station, the explosion-proof valve pre-processing mold is closed, so that the reverse top first presses the upper end surface of the top cover sheet, and the pre-pier punch is pressed down, so as to pre-form a convex hull structure on the top cover sheet and force the excess material to move to the empty groove; the depth of the convex hull structure is h1;

[0013] Step 4, second trimming: when the material strip is fed to the second trimming station, the second trimming die is pressed down to perform fine punching on the multiple empty slots, and flush out the material that moves toward the empty slots during the pre-processing of the explosion-proof valve;

[0014] Step 5, explosion-proof valve finishing: when the material strip is fed to the explosion-proof valve finishing station, the explosion-proof valve finishing upper die is pressed down to finish the convex hull structure; the depth of the finished convex hull structure is h2, and h2>h1;

[0015] Step 6, explosion-proof valve notching: when the material strip is fed to the explosion-proof valve notching station, the explosion-proof valve notching processing mold is closed, so that the explosion-proof valve notching convex mold presses out a notch on the convex hull structure, and the excess material moves to the avoidance position;

[0016] Step 7, blanking: When the material belt is fed to the blanking station, the blanking die presses down to punch out the top cover piece.

[0017] Compared with the prior art, in the present invention, in step 2, a plurality of empty grooves are processed by the first trimming, and the plurality of empty grooves pre-process the shape of the top cover sheet, and in the pre-processing of the explosion-proof valve in step 3, since the reverse top first presses the upper end surface of the top cover sheet, and the pre-pier punch is pressed down again, the material whose upper end surface of the top cover sheet is more concave than the convex hull structure can only go to the empty groove processed in step 2, and in step 4, the plurality of empty grooves are fine-punched, which not only fine-processes the shape of the top cover sheet, but also punches out the excess material going to the empty groove in step 3, thereby avoiding the excess material from surging upward and avoiding the collision phenomenon in subsequent processing; in step 5, the convex hull structure is fine-processed. Step 3 has pre-processed the explosion-proof valve, so that the depth of the convex hull structure has reached h1. In this step, the depth of the convex hull structure is deepened to h2, so that the material flow of the convex hull structure is smoother, so as to improve the stability and flatness of the convex hull structure, and prevent the material from surging upward again during the fine processing of the explosion-proof valve; in step 6, since the fine processing of the explosion-proof valve has been completed, the processing of the notch will no longer be affected by the material flow during other processing steps of the explosion-proof valve, and the convex hull structure has achieved good stability and flatness, which provides favorable conditions for stable production of the notch. During processing, the excess material formed by the pressed notch can move to the avoidance position, thereby ensuring the stability of the notch.

[0018] The present invention provides a forming process for an explosion-proof valve integrated top cover sheet, wherein the explosion-proof valve pre-processing mold includes an explosion-proof valve pre-processing upper mold and an explosion-proof valve pre-processing lower mold; the explosion-proof valve pre-processing upper mold includes a pre-pier upper template structure and a pre-pier stripping structure movably connected to the pre-pier upper template structure, which are arranged in sequence from top to bottom; the pre-pier punch is arranged on the pre-pier upper template structure; and the anti-top is arranged on the lower end surface of the pre-pier stripping structure.

[0019] The present invention provides a process for forming an explosion-proof valve integrated top cover sheet, wherein step 3 includes the following sub-steps:

[0020] Step 31: During the process of pressing down the upper die of the explosion-proof valve pre-processing, the reverse top portion first contacts the upper end surface of the top cover sheet;

[0021] Step 32: the explosion-proof valve pre-processing upper die continues to be pressed downward, and the pre-pier punch passes through the pre-pier stripping structure and the reverse top to contact the upper end surface of the top cover sheet;

[0022] Step 32: The explosion-proof valve pre-processing upper die is further pressed downward, and the pre-pier punch and the explosion-proof valve pre-processing lower die pre-form a convex structure on the top cover sheet.

[0023] The present invention provides a forming process for an integrated top cover sheet of an explosion-proof valve, wherein the empty groove comprises a side empty groove arranged along the length direction of the top cover sheet; the convex hull structure is arranged between two side empty grooves;

[0024] In step 32, when the convex structure is preformed, the excess material moves toward the two sides and into the two side grooves respectively.

[0025] The present invention provides a forming process for an integrated top cover sheet of an explosion-proof valve, wherein the convex hull structure comprises a convex hull body and a thin wall arranged along the edge of the convex hull body; the convex hull body is fixedly connected to the top cover sheet via the thin wall.

[0026] In the process for forming an explosion-proof valve integrated top cover sheet of the present invention, in step 3, the thickness of the thin wall is a1;

[0027] The explosion-proof valve finishing station includes a finishing station and a leveling station which are arranged continuously;

[0028] Step 5 includes the following sub-steps:

[0029] Step 51: the fine punching mold of the fine punching station is pressed down, so that the depth of the convex hull body changes from h1 to h2, and the thickness of the thin wall changes from a1 to a2, and a2<a1;

[0030] Step 52: The flattening mold of the flattening station is pressed down to flatten the thin wall.

[0031] The present invention provides a forming process for an explosion-proof valve integrated top cover sheet, wherein the explosion-proof valve notching processing mold includes an explosion-proof valve notching upper mold and an explosion-proof valve notching lower mold; the explosion-proof valve notching upper mold includes a notching upper template structure arranged in sequence from top to bottom and a notching stripping structure movably connected to the notching upper template structure; the explosion-proof valve notching convex mold is arranged on the notching upper template structure; the explosion-proof valve notching convex mold includes a notching convex mold body; the avoidance position is surrounded by the notching convex mold body.

[0032] The present invention provides a process for forming an explosion-proof valve integrated top cover sheet, wherein step 6 includes the following sub-steps:

[0033] Step 61: during the process of pressing down the explosion-proof valve scoring upper die, the scoring stripping structure first contacts the upper end surface of the top cover sheet;

[0034] Step 62: the explosion-proof valve notch upper die continues to be pressed downward, and the explosion-proof valve notch convex die passes through the notch stripping structure and contacts the upper end surface of the thin wall;

[0035] Step 63: The explosion-proof valve notching upper die is further pressed downward, and the notching punch body forms a notch on the upper end surface of the thin wall, and makes excess material enter the avoidance position.

[0036] The present invention provides a forming process for an explosion-proof valve integrated top cover sheet, wherein the explosion-proof valve notching processing mold further includes a notching punch adjusting gasket; the notching punch adjusting gasket is arranged between the notching upper template structure and the explosion-proof valve notching punch to adjust the depth of the notch.

[0037] The present invention provides a forming process for an integrated explosion-proof valve top cover sheet, wherein the top cover sheet further comprises a groove, a pole, a convex point and a liquid injection hole; the stamping equipment further comprises a top cover sheet finishing station; the top cover sheet finishing station is located between the explosion-proof valve finishing station and the explosion-proof valve notching station;

[0038] The grooves, poles, convex points and injection holes are first pre-processed in at least one of the first trimming station, the explosion-proof valve pre-processing station, the second trimming station and the explosion-proof valve finishing station, and then finished in the top cover sheet finishing station. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the process arrangement of the present invention;

[0040] Figure 2 This is a schematic diagram of the process layout of the first trimming station;

[0041] Figure 3 This is a schematic diagram of the process layout of the explosion-proof valve pre-processing station;

[0042] Figure 4 This is an enlarged schematic diagram of the convex hull structure under the explosion-proof valve pre-processing station;

[0043] Figure 5 This is a schematic diagram of the state of the explosion-proof valve pre-processing mold when it is opened;

[0044] Figure 6 This is a schematic diagram of the state of the explosion-proof valve pre-processing mold when the mold is closed;

[0045] Figure 7 It is an enlarged schematic diagram of the pre-pier punch and the counter top;

[0046] Figure 8 It is a side view schematic diagram of the lower top cover piece of the explosion-proof valve finishing station;

[0047] Fig. 9 This is a schematic diagram of the convex structure of the explosion-proof valve after fine processing;

[0048] Fig.10 It is a side view schematic diagram of the top cover sheet of the explosion-proof valve scoring station;

[0049] Fig.11 is an enlarged schematic diagram of the notch;

[0050] Fig.12This is a schematic diagram of the structure of the explosion-proof valve scoring mold;

[0051] Fig.13 It is an enlarged schematic diagram of the notch punch of the explosion-proof valve;

[0052] Fig.14 It is a schematic diagram of the working state of the notching punch body and the avoidance position;

[0053] Fig.15 This is a schematic diagram of the top cover piece punched out at the blanking station;

[0054] In the figure, the first trimming station 1, the explosion-proof valve pre-processing station 2, the second trimming station 3, the explosion-proof valve finishing station 4, the explosion-proof valve notching station 5, the blanking station 6, the material strip 7, the top cover sheet finishing station 8; the explosion-proof valve pre-processing mold 21; the fine pier station 41, the flattening station 42; the explosion-proof valve notching processing mold 51; the empty groove 71, the top cover sheet 72; the pre-piercing punch 211, the reverse top 212, the explosion-proof valve pre-processing upper mold 213, the explosion-proof valve pre-processing lower mold 214; the explosion-proof valve notching Marking punch 511, explosion-proof valve scoring upper die 512, explosion-proof valve scoring lower die 513, scoring punch adjusting gasket 514; empty groove 711; convex hull structure 721, groove 722, pole 723, convex point 724, injection hole 725; pre-pier upper template structure 2131, pre-pier stripping structure 2132; avoidance position 5111, scoring punch body 5112; scoring upper template structure 5121, scoring stripping structure 5122; convex hull body 7211, thin wall 7212. DETAILED DESCRIPTION

[0055] Before describing in detail any embodiment of the present invention, it should be understood that the present invention is not limited in its application to the construction and arrangement details of the components described below or illustrated in the following figures. The present invention can have other embodiments and can be practiced or carried out in various ways. In addition, it should be understood that the words and terms used here are for descriptive purposes and should not be considered restrictive. The use of "including" or "having" and its variations herein is intended to cover the items and their equivalents and additional items displayed below. Unless otherwise specified or limited, the terms "install", "connect", "support" and "couple" and their variations are widely used and cover direct installation and indirect installation, connection, support and connection. In addition, "connect" and "couple" are not limited to physical or mechanical connections or connections.

[0056] Furthermore, on the first aspect, in the disclosure of the present invention, the orientation or positional relationship indicated by terms such as "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or positional relationship shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore the above terms cannot be understood as limitations on the present invention; on the second aspect, the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" cannot be understood as a limitation on the quantity.

[0057] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

[0058] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0059] See also Figure 1-15 The process for forming an explosion-proof valve integrated top cover sheet shown in the figure comprises a stamping device, wherein the stamping device comprises a first trimming station 1, an explosion-proof valve pre-processing station 2, a second trimming station 3, an explosion-proof valve finishing station 4, an explosion-proof valve notching station 5 and a blanking station 6; the explosion-proof valve pre-processing station 2 is provided with an explosion-proof valve pre-processing mold 21; the explosion-proof valve pre-processing mold 21 comprises a pre-piercing punch 211 and a counter top 212; the explosion-proof valve notching station 5 is provided with an explosion-proof valve notching processing mold 51; the explosion-proof valve notching processing mold 51 comprises an explosion-proof valve notching punch 511; the explosion-proof valve notching punch 511 has an avoidance position 5111;

[0060] The molding process includes the following steps:

[0061] Step 1, feeding: taking the material belt 7 and feeding it into the stamping equipment, so that the material belt 7 is continuously fed forward in steps on the stamping equipment;

[0062] Step 2, first trimming: when the material strip 7 is fed to the first trimming station 1, the first trimming mold is pressed down to pre-punch a plurality of empty grooves 71 on the material strip 7, and the interior of the plurality of empty grooves 71 forms a top cover sheet 72;

[0063] Step 3, explosion-proof valve pre-processing: When the material strip 7 is fed to the explosion-proof valve pre-processing station 2, the explosion-proof valve pre-processing mold 21 is closed, so that the reverse top 212 first presses the upper end surface of the top cover sheet 72, and the pre-pier punch 211 is pressed down to pre-form a convex structure 721 on the top cover sheet 72, and force the excess material to move to the empty groove 71; the depth of the convex structure 721 is h1;

[0064] Step 4, second trimming: when the material strip 7 is fed to the second trimming station 3, the second trimming die is pressed down to perform fine punching on multiple empty slots 71, and flush out the material that goes to the empty slots 71 during the pre-processing of the explosion-proof valve;

[0065] Step 5, explosion-proof valve finishing: when the material strip 7 is fed to the explosion-proof valve finishing station 4, the explosion-proof valve finishing upper die is pressed down to finish the convex hull structure 721; the depth of the finished convex hull structure 721 is h2, and h2>h1;

[0066] Step 6, explosion-proof valve notching: when the material belt 7 is fed to the explosion-proof valve notching station 5, the explosion-proof valve notching processing mold 51 is closed, so that the explosion-proof valve notching convex mold 511 presses out notches on the convex hull structure 721, and the excess material moves to the avoidance position 5111;

[0067] Step 7, blanking: When the material belt 7 is fed to the blanking station 6, the blanking die is pressed down to punch down the top cover sheet 72.

[0068] In the actual processing process, the present invention processes multiple empty grooves 71 through the first trimming in step 2, and the multiple empty grooves 71 pre-process the shape of the top cover sheet 72. In the pre-processing of the explosion-proof valve in step 3, since the reverse top 212 first presses the upper end surface of the top cover sheet 72, and the pre-pier punch 211 presses down again, the material whose upper end surface of the top cover sheet 72 is more concave than the convex hull structure 721 can only go to the empty groove 71 processed in step 2. In step 4, the multiple empty grooves 71 are fine-punched, which not only fine-processes the shape of the top cover sheet 72, but also washes away the excess material that goes to the empty groove in step 3, thereby avoiding the excess material from surging upward and avoiding the collision phenomenon in subsequent processing; in step 5, the convex hull structure 721 is fine-punched. In step 6, since the explosion-proof valve has been pre-processed in step 3, the depth of the convex hull structure 721 has reached h1. In this step, the depth of the convex hull structure 721 is deepened to h2, so that the material flow of the convex hull structure 721 is smoother, so as to improve the stability and flatness of the convex hull structure 721, and prevent the material from surging upward again during the fine processing of the explosion-proof valve; in step 6, since the fine processing of the explosion-proof valve has been completed, the processing of the notch will no longer be affected by the material flow during other processing steps of the explosion-proof valve, and the convex hull structure 721 has achieved good stability and flatness, which provides favorable conditions for the stable production of the notch. During processing, the excess material formed by the pressed notch can go to the avoidance position 5111, thereby ensuring the stability of the notch.

[0069] Please continue reading Figure 5 , Figure 6 , Figure 7 The explosion-proof valve pre-processing mold 21 includes an explosion-proof valve pre-processing upper mold 213 and an explosion-proof valve pre-processing lower mold 214; the explosion-proof valve pre-processing upper mold 213 includes a pre-pier upper template structure 2131 and a pre-pier stripping structure 2132 movably connected to the pre-pier upper template structure 2131, which are arranged in sequence from top to bottom; the pre-pier punch 211 is arranged on the pre-pier upper template structure 2131; and the anti-top 212 is arranged on the lower end surface of the pre-pier stripping structure 2132.

[0070] Please continue reading Figure 3-5 , step 3 includes the following sub-steps:

[0071] Step 31: During the process of pressing down the explosion-proof valve pre-processing upper die 213, the reverse top portion 212 first contacts the upper end surface of the top cover sheet 72;

[0072] Step 32: The explosion-proof valve pre-processing upper die 213 continues to be pressed downward, and the pre-pier punch 211 passes through the pre-pier stripping structure 2132 and the reverse top 212 to contact the upper end surface of the top cover sheet 72;

[0073] Step 32 : the explosion-proof valve pre-processing upper die 213 is further pressed downward, and the pre-piercing punch 211 and the explosion-proof valve pre-processing lower die 214 pre-form a convex structure 721 on the top cover sheet 72 .

[0074] Specifically, when the material strip 7 is conveyed forward step by step to the explosion-proof valve pre-processing station 2, the explosion-proof valve pre-processing upper mold 213 and the explosion-proof valve pre-processing lower mold 214 are closed. At this time, the material outside the convex structure 721 is compacted by the anti-top 212, the pre-pier stripping structure 2132 and the pre-pier upper template structure 2131, so that the material outside the convex structure 721 can no longer surge upward. Under the pressure of the pre-pier punch 211, the excess material is forced to move toward the multiple empty grooves 71 that have been pre-processed in step 2, thereby ensuring the flatness of the upper and lower end surfaces of the material strip 7; when the explosion-proof valve pre-processing upper mold 213 and the explosion-proof valve pre-processing lower mold 214 are opened, due to the better flatness of the upper and lower end surfaces of the material strip 7, the material strip 7 will not collide with the mold of the subsequent processing step due to the upward surge of material during the process of continuing to step forward.

[0075] Please continue reading Figure 2 , wherein the slot 71 includes a side slot 711 arranged along the length direction of the top cover sheet 72; the convex structure 721 is arranged between the two side slots 711;

[0076] In step 32 , when the convex structure 721 is preformed, the excess material moves toward the two side grooves 711 on both sides.

[0077] It can be understood that in step 2, the empty groove 71 also includes the empty grooves at both ends arranged along the width direction of the top cover sheet 72 and the T-shaped empty grooves respectively arranged at the four corners of the top cover sheet 72, and these empty grooves together pre-form the shape of the top cover sheet 72; wherein, since the side empty groove 711 is arranged along the length direction of the top cover sheet 72 and the distance from the convex structure 721 is shorter, when the explosion-proof valve pre-processing upper mold 213 and the explosion-proof valve pre-processing lower mold 214 are molded in step 3, the excess material will preferentially flow to the two side empty grooves 711 with a shorter distance under less resistance; if the side empty groove 711 is not arranged along the length direction of the top cover sheet 72 and the distance from the convex structure 721 is shorter, the excess material may flow to the empty grooves at both ends and the T-shaped empty groove, causing the top cover sheet 72 to deform, or forcing the material to surge upward and damage the top 212.

[0078] Please continue reading Figure 7 , Fig. 9 , wherein the convex structure 721 includes a convex body 7211 and a thin wall 7212 arranged along the edge of the convex body 7211; the convex body 7211 is fixedly connected to the top cover sheet 72 through the thin wall 7212.

[0079] Please continue reading Figure 7 , Fig. 9 , in step 3, the thickness of the thin wall 7212 is a1;

[0080] The explosion-proof valve finishing station 4 includes a finishing station 41 and a flattening station 42 which are arranged continuously;

[0081] Step 5 includes the following sub-steps:

[0082] Step 51: the fine punching mold of the fine punching station 41 is pressed down to make the depth of the convex hull body 7211 change from h1 to h2, and the thickness of the thin wall 7212 change from a1 to a2, and a2<a1;

[0083] Step 52: The flattening mold of the flattening station 42 is pressed down to flatten the thin wall 7212.

[0084] Please continue reading Figure 1 , Figure 8 When the material strip 7 steps forward to the fine punching station 41, the fine punching mold is pressed down to press the depth of the convex hull body 7211 from h1 to h2. At this time, since the convex hull body 7211 has sunk to the depth h1 after the pre-processing in step 3, when it is pressed down again, the thickness of the thin wall 7212 is reduced from a1 to a2, and the squeezed material will preferentially move toward the convex hull body 7211 under less resistance, rather than surge upward again; under this process, the stability and flatness of the thin wall 7212 can be improved, and the phenomenon of material surge upward again during the fine processing of the explosion-proof valve can be prevented.

[0085] Please continue reading Figure 1 , Figure 8 When the material strip 7 steps forward to the flattening station 42, the surface of the thin wall 7212 may still be uneven due to the high pressure when the fine pier mold is pressed down. When the flattening mold is pressed down, the surface of the thin wall 7212 can be adjusted and flattened, thereby further improving the stability and flatness of the thin wall 7212 and providing a basis for subsequent high-stability notching.

[0086] Please continue reading Fig.12 , Fig.13 , Fig.14 , wherein the explosion-proof valve notching processing mold 51 includes an explosion-proof valve notching upper mold 512 and an explosion-proof valve notching lower mold 513; the explosion-proof valve notching upper mold 512 includes a notching upper template structure 5121 and a notching stripping structure 5122 movably connected to the notching upper template structure 5121, which are arranged in sequence from top to bottom; the explosion-proof valve notching punch 511 is arranged on the notching upper template structure 5121; the explosion-proof valve notching punch 511 includes a notching punch body 5112; and the avoidance position 5111 is surrounded by the notching punch body 5112.

[0087] The present invention provides a process for forming an explosion-proof valve integrated top cover sheet, wherein step 6 includes the following sub-steps:

[0088] Step 61: During the process of pressing down the explosion-proof valve notch upper die 512, the notch stripping structure 5122 first contacts the upper end surface of the top cover sheet 72;

[0089] Step 62: the explosion-proof valve notch upper die 512 continues to be pressed downward, and the explosion-proof valve notch convex die 511 passes through the notch stripping structure 5122 and contacts the upper end surface of the thin wall 7212;

[0090] Step 63: The explosion-proof valve notching upper die 512 is further pressed downward, and the notching punch body 5112 forms a notch on the upper end surface of the thin wall 7212, and the excess material enters the avoidance position 5111.

[0091] Specifically, explosion-proof valve notching station 5 is after explosion-proof valve finishing station 4, that is, after all other features of the explosion-proof valve are processed, the notch is processed last, so as to avoid the influence of material movement on the notch when other features of the explosion-proof valve are processed, and the thin wall 7212 has been finished and flattened in step 5, so that the thin wall 7212 itself has high stability. On these two basis, the notch is processed on the thin wall 7212 to improve the stability of the notch; when the material strip 7 is stepped forward to the explosion-proof valve notching station 5, the explosion-proof valve notching upper mold 512 and the explosion-proof valve notching lower mold 513 are molded together, so that the notch punch body 5112 is pressed into the upper end surface of the thin wall 7212 and the notch is formed, and the material moved by the squeezing of the notch punch body 5112 moves to the avoidance position 5111, giving the notch a deformation zone for upward material movement, thereby further ensuring the stable forming of the notch.

[0092] Please continue reading Fig.13 , wherein the explosion-proof valve notching processing mold 51 further includes a notching punch adjusting gasket 514; the notching punch adjusting gasket 514 is arranged between the notching upper template structure 5121 and the explosion-proof valve notching punch 511 to adjust the depth of the notch.

[0093] Specifically, the notching punch adjusting gasket 514 has a variety of different specifications. By replacing the notching punch adjusting gasket 514 of different specifications, the pressing depth of the explosion-proof valve notching punch 511 can be controlled, thereby controlling the depth of the upper notch of the thin wall 7212.

[0094] Please continue reading Figure 1 , Fig.15 , wherein the top cover sheet 72 further includes a groove 722, a pole 723, a convex point 724 and a liquid injection hole 725; the stamping equipment further includes a top cover sheet finishing station 8; the top cover sheet finishing station 8 is located between the explosion-proof valve finishing station 4 and the explosion-proof valve notching station 5;

[0095] The groove 722 , the pole 723 , the protrusion 724 and the injection hole 725 are first pre-processed in at least one of the first trimming station 1 , the explosion-proof valve pre-processing station 2 , the second trimming station 3 and the explosion-proof valve finishing station 4 , and then finished in the top cover sheet finishing station 8 .

[0096] It can be understood that the top cover sheet 72 further includes features such as grooves 722, poles 723, protrusions 724 and injection holes 725 in order to meet the requirements of installation of the top cover sheet, power-on of new energy batteries, etc. These features can be pre-processed in at least one of the first trimming station 1, the explosion-proof valve pre-processing station 2, the second trimming station 3 and the explosion-proof valve finishing station 4, and then finished in the top cover sheet finishing station 8. After the top cover sheet finishing station 8 is completed, the material strip 7 enters the explosion-proof valve notching station 5 for explosion-proof valve notching processing, thereby avoiding the influence of material movement on the notch during processing in the top cover sheet finishing station 8, thereby further improving the stability of the notch.

[0097] Please continue reading Figure 1 , Fig.15 After the explosion-proof valve notching station 5 completes the last notch of the explosion-proof valve, the material strip 7 enters the blanking station 6, and the blanking die is punched out. Fig.15 The top cover piece 72 is shown.

[0098] The above description is only for the best embodiment of the present invention, but it should not be understood as limiting the claims. The present invention is not limited to the above embodiments, and its specific structure is allowed to be changed. All changes made within the scope of protection of the independent claims of the present invention are within the scope of protection of the present invention.

Claims

1. A process for forming an integrated top cover sheet of an explosion-proof valve, characterized in that: The invention comprises a stamping device, wherein the stamping device comprises a first trimming station (1), an explosion-proof valve pre-processing station (2), a second trimming station (3), an explosion-proof valve finishing station (4), an explosion-proof valve notching station (5) and a blanking station (6); the explosion-proof valve pre-processing station (2) is provided with an explosion-proof valve pre-processing die (21); the explosion-proof valve pre-processing die (21) comprises a pre-piercing punch (211) and a counter top (212); the explosion-proof valve notching station (5) is provided with an explosion-proof valve notching processing die (51); the explosion-proof valve notching processing die (51) comprises an explosion-proof valve notching punch (511); the explosion-proof valve notching punch (511) has an avoidance position (5111); The molding process includes the following steps: Step 1, loading: taking the material belt (7) and feeding it into the stamping equipment, so that the material belt (7) is continuously fed forward on the stamping equipment; Step 2, first trimming: when the material strip (7) is fed to the first trimming station (1), the first trimming mold is pressed down to pre-punch out a plurality of empty grooves (71) on the material strip (7), and the interior of the plurality of empty grooves (71) forms a top cover sheet (72); Step 3, explosion-proof valve pre-processing: when the material strip (7) is fed to the explosion-proof valve pre-processing station (2), the explosion-proof valve pre-processing mold (21) is closed so that the reverse top (212) first presses the upper end surface of the top cover sheet (72), and the pre-pier punch (211) is then pressed down to pre-form a convex hull structure (721) on the top cover sheet (72) and force excess material to move toward the empty groove (71); the depth of the convex hull structure (721) is h1; Step 4, second trimming: when the material strip (7) is fed to the second trimming station (3), the second trimming die is pressed down to perform fine punching on the plurality of empty slots (71) and flush out the material that has moved toward the empty slots (71) during the pre-processing of the explosion-proof valve; Step 5, finishing of the explosion-proof valve: when the material strip (7) is fed to the finishing station (4) for the explosion-proof valve, the finishing die for the explosion-proof valve is pressed downward to finish the convex hull structure (721); the depth of the finished convex hull structure (721) is h2, and h2>h1; Step 6, explosion-proof valve notching: when the material belt (7) is fed to the explosion-proof valve notching station (5), the explosion-proof valve notching processing mold (51) is closed, so that the explosion-proof valve notching punch (511) presses a notch on the convex hull structure (721), and the excess material moves to the avoidance position (5111); Step 7, blanking: When the material belt (7) is fed to the blanking station (6), the blanking die is pressed down to flush the top cover sheet (72).

2. The process for forming an explosion-proof valve integrated top cover sheet according to claim 1, characterized in that: The explosion-proof valve pre-processing mold (21) comprises an explosion-proof valve pre-processing upper mold (213) and an explosion-proof valve pre-processing lower mold (214); the explosion-proof valve pre-processing upper mold (213) comprises a pre-pier upper template structure (2131) and a pre-pier stripping structure (2132) movably connected to the pre-pier upper template structure (2131) arranged in sequence from top to bottom; the pre-pier punch (211) is arranged on the pre-pier upper template structure (2131); and the anti-top (212) is arranged on the lower end surface of the pre-pier stripping structure (2132).

3. The explosion-proof valve integrated top cover sheet forming process according to claim 2, characterized in that: Step 3 includes the following sub-steps: Step 31: During the process of pressing down the explosion-proof valve pre-processing upper die (213), the reverse top portion (212) first contacts the upper end surface of the top cover sheet (72); Step 32: the explosion-proof valve pre-processing upper die (213) continues to be pressed downward, and the pre-pier punch (211) passes through the pre-pier stripping structure (2132) and the reverse top (212) to contact the upper end surface of the top cover sheet (72); Step 32: the explosion-proof valve pre-processing upper die (213) is further pressed downward, and the pre-pier punch (211) and the explosion-proof valve pre-processing lower die (214) pre-form a convex structure (721) on the top cover sheet (72).

4. The process for forming an explosion-proof valve integrated top cover sheet according to claim 3, characterized in that: The empty groove (71) comprises a side empty groove (711) arranged along the length direction of the top cover sheet (72); the convex hull structure (721) is arranged between two side empty grooves (711); In step 32, when the convex hull structure (721) is preformed, excess material moves toward the two sides and into the two side empty grooves (711).

5. The process for forming an explosion-proof valve integrated top cover sheet according to claim 1, characterized in that: The convex hull structure (721) comprises a convex hull body (7211) and a thin wall (7212) arranged along the edge of the convex hull body (7211); the convex hull body (7211) is fixedly connected to the top cover sheet (72) via the thin wall (7212).

6. The process for forming an explosion-proof valve integrated top cover sheet according to claim 5, characterized in that: In step 3, the thickness of the thin wall (7212) is a1; The explosion-proof valve finishing station (4) comprises a finishing station (41) and a leveling station (42) which are arranged in series; Step 5 includes the following sub-steps: Step 51: the fine punching mold of the fine punching station (41) is pressed downward, so that the depth of the convex hull body (7211) changes from h1 to h2, and the thickness of the thin wall (7212) changes from a1 to a2, and a2<a1; Step 52: The flattening mold of the flattening station (42) is pressed down to flatten the thin wall (7212).

7. The process for forming an explosion-proof valve integrated top cover sheet according to claim 5, characterized in that: The explosion-proof valve notching processing mold (51) comprises an explosion-proof valve notching upper mold (512) and an explosion-proof valve notching lower mold (513); the explosion-proof valve notching upper mold (512) comprises a notching upper template structure (5121) arranged in sequence from top to bottom and a notching stripping structure (5122) movably connected to the notching upper template structure (5121); the explosion-proof valve notching convex mold (511) is arranged on the notching upper template structure (5121); the explosion-proof valve notching convex mold (511) comprises a notching convex mold body (5112); and the avoidance position (5111) is surrounded by the notching convex mold body (5112).

8. The process for forming an explosion-proof valve integrated top cover sheet according to claim 7, characterized in that: Step 6 includes the following sub-steps: Step 61: During the process of pressing down the explosion-proof valve notch upper die (512), the notch stripping structure (5122) first contacts the upper end surface of the top cover sheet (72); Step 62: the explosion-proof valve notch upper die (512) continues to be pressed downward, and the explosion-proof valve notch convex die (511) passes through the notch stripping structure (5122) and contacts the upper end surface of the thin wall (7212); Step 63: The explosion-proof valve notching upper die (512) is further pressed downward, and the notching convex die body (5112) forms a notch on the upper end surface of the thin wall (7212), and causes excess material to enter the avoidance position (5111).

9. The process for forming an explosion-proof valve integrated top cover sheet according to claim 7, characterized in that: The explosion-proof valve notching processing mold (51) further comprises a notching punch adjustment gasket (514); the notching punch adjustment gasket (514) is arranged between the notching upper mold plate structure (5121) and the explosion-proof valve notching punch (511) so as to adjust the notch depth.

10. The process for forming an explosion-proof valve integrated top cover sheet according to claim 1, characterized in that: The top cover sheet (72) further comprises a groove (722), a pole (723), a convex point (724) and a liquid injection hole (725); the stamping equipment further comprises a top cover sheet finishing station (8); the top cover sheet finishing station (8) is located between the explosion-proof valve finishing station (4) and the explosion-proof valve notching station (5); The groove (722), the pole (723), the convex point (724) and the injection hole (725) are first pre-processed in at least one of the first trimming station (1), the explosion-proof valve pre-processing station (2), the second trimming station (3) and the explosion-proof valve finishing station (4), and then finished in the top cover sheet finishing station (8).

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