Appearance step forming method of steel top cover plate

Abstract

The invention provides an appearance step forming method for a steel top cover piece. The appearance step forming method comprises the steps that S1, after a metal material strip passes through a pre-trimming station, a blank piece with a forming area and a blanking area is formed on the metal material strip in a blanking mode; s2, the blank is conveyed to a bag pulling female die at a bag pulling station, pressing force is applied to the blank through a pressing boss on a bag pulling male die, and the part, between the forming area and the discharging area, of the blank extends into a groove, located in the outer edge of the pressing boss, of the bag pulling male die to form an annular boss; s3, the blank is conveyed to a side pushing station, a side pushing mechanism applies pressure to the annular boss, the annular boss is made to horizontally move towards the discharging area till the annular boss completely falls into the discharging area, and the smooth and complete upper surface of the steel top cover piece is formed in the forming area; and S4, the blank is conveyed to an appearance trimming station, blanking is conducted on the joint of the forming area and the blanking area, the steel top cover piece is formed in the forming area, and the blanking area is separated from the steel top cover piece.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of battery manufacturing for new energy vehicles, and specifically to a method for forming a step shape of a steel roof cover sheet. Background Art

[0002] At present, new energy lithium batteries are becoming more and more popular, and have become an important direction for future energy competition. Green energy will also become a key development direction in the future. In order to enhance the market competitiveness of lithium batteries, product accuracy requirements and dimensional consistency requirements have become more stringent. Under the fierce market competition, equipment stability and product consistency have become more important.

[0003] Top cover products as shown on the right Figures 9 to 11 As shown:

[0004] The material of the roof sheet is usually aluminum alloy 3003H14, with a hardness of HV37-57. The low hardness makes it exhibit good fluidity during the forming process. The side steps can be easily formed using the traditional pier pressing method. Because the material is soft, it can be formed under low pressure, which significantly improves production efficiency and product consistency. This processing characteristic of aluminum alloy makes it the preferred material in many applications, especially in situations where high forming accuracy and appearance quality are required.

[0005] However, for SUS 304 stainless steel, the hardness is significantly higher than that of aluminum alloy, reaching HV200-300, which poses a challenge to the conventional pier forming process. High hardness means that the material is harder when subjected to force and has poor fluidity, making it difficult to achieve the expected step height during forming, and a large area of ​​embossing is produced on the back of the step, affecting the appearance and dimensional accuracy of the final product. In this case, the traditional pier pressing method often cannot meet the forming requirements, so a more effective forming process needs to be considered. Summary of the invention

[0006] The problem to be solved by the present invention is to provide a method for forming the outer step of a steel top cover sheet, which solves the problem that the SUS 304 steel top cover sheet with side steps cannot reach the expected step height and produces a large area of ​​embossing on the back of the step.

[0007] The technical solution adopted by the present invention to solve the above problem is: a method for forming a step shape of a steel roof cover sheet, comprising the following steps:

[0008] Step S1, after the metal strip passes through the pre-trimming station, a blank having a forming area and a blanking area is punched out on the metal strip;

[0009] Step S2, conveying the blank to the bag drawing die at the bag drawing station, and applying a pressing force to the blank by the pressing boss on the bag drawing convex die, so that the portion between the forming area and the blanking area of ​​the blank extends into the groove located at the outer edge of the pressing boss on the bag drawing convex die to form an annular boss;

[0010] Step S3, conveying the blank to the side push station, the side push mechanism applies pressure to the annular boss, so that the annular boss moves toward the blanking area until it completely falls into the blanking area, and at the same time forms a smooth and complete upper surface of the steel top cover sheet in the forming area;

[0011] Step S4, conveying the blank to the outer shape trimming station, blanking the connection between the forming area and the blanking area, so that the forming area forms a steel top cover sheet, and the blanking area is separated from the steel top cover sheet.

[0012] Compared with the prior art, the step-shaped forming method of the steel roof sheet designed by the present invention has the following beneficial effects:

[0013] Through step S1, the blank shape is cut, and a blank is cut out from the metal strip by punching or other cutting methods. The blank has a forming area for forming a steel top cover sheet and a margin is set on the periphery of the forming area to form a blanking area to facilitate subsequent forming.

[0014] Step S2 is the bag forming process, in which the cut blank is placed in the bag forming die at the bag forming station. The blank is pressed by the pressing boss on the bag forming convex die, so that the part between the forming area and the blanking area of ​​the blank extends into the groove at the outer edge of the pressing boss on the bag forming convex die to form an annular boss. Compared with the previous pier pressing, the space for deformation is provided to allow the blank to deform, and this bag forming method has better fluidity and is more conducive to deformation during the material forming process.

[0015] Step S3 forms a complete upper surface of the steel top cover sheet, and applies pressure to the annular boss so that the annular boss is translated toward the blanking area until it completely falls into the blanking area, thereby forming a smooth and complete upper surface of the steel top cover sheet. The annular boss generated in step S2 is translated toward the blanking area. Compared with the previous method of directly pressing on the upper end surface of the steel top cover sheet to form a thin imprint that cannot be removed, the present invention sets a deformation space in a pulling bag manner through step 2 for the blank to deform freely, so as to achieve a better forming effect, and makes the annular boss formed by the deformed part concentrated between the forming area and the blanking area, and then squeezes the annular boss toward the blanking area in a manner similar to smoothing through step S3. Since it is a protrusion, the lateral force is not blocked and can be freely extruded and translated to the blanking area. Compared with the previous method of pressing, the force in the force direction is more concentrated, so that the smoothing effect is also better, thereby solving the problems of large-area imprints on the upper surface of the steel top cover sheet and difficulty in achieving the expected step height.

[0016] Step S4 is to cut the shape. The blank is transferred to the shape trimming station by punching or other cutting methods. The connection between the forming area and the blanking area is blanked to form a steel top cover sheet in the forming area, while the blanking area is separated from the steel top cover sheet. The blanking area and the annular boss pushed to the blanking area in step S3 are cut off to achieve the shaping of the shape of the steel top cover sheet.

[0017] Preferably, the side-pushing station is provided with a side-pushing mechanism, which includes a fixed plate, a movable plate, and a side-pushing die. The upper end surface of the side-pushing die has a placement surface for placing a blank. A bevel block is installed at the lower end of the fixed plate. A driving bevel is provided at the lower end of the bevel block. A slide rail is provided on the movable plate and is arranged from the forming area toward the blanking area. A side-pushing block corresponding to the driving bevel on the bevel block is provided on the slide rail.

[0018] Wherein step S3 comprises:

[0019] Step S31, driving the movable plate to move toward the blank until the lower end surface of the side push block is in contact with the upper surface of the forming area of ​​the blank;

[0020] Step S32, driving the fixed plate to drive the driving inclined surface of the bevel block to apply a thrust to the side push block, so that the side push block moves along the slide rail to the lower part of its side surface against the annular boss;

[0021] In step S33, the lower side of the side push block applies pressure to the inner wall of the annular boss, so that the annular boss as a whole moves toward the blanking area with the movement of the bevel block until it completely falls into the blanking area, and at the same time forms a smooth and complete upper surface of the steel top cover sheet in the forming area.

[0022] Preferably, the side push mechanism also includes a reset structure, which includes a stop block arranged at the movement path of the side push block, and a first elastic member is installed between the stop block and the end surface of the side push block facing the inner wall, and the first elastic member applies elastic force to the side push block to make the side push block move to the initial position in the opposite direction toward the inner wall.

[0023] Preferably, the side-pushing station is further provided with a pre-pressing block and an elastic component, wherein the pre-pressing block is slidably connected to the fixing plate up and down via a connecting rod, and the elastic component drives the pre-pressing block to be pressed toward the placement surface.

[0024] Preferably, the connecting rod includes a rod body and a connecting head arranged at one end of the rod body, the fixing plate is provided with a mounting hole and a matching hole arranged from top to bottom, the rod body and the matching hole are slidably connected up and down, the connecting head rests on the connecting end surface of the mounting port and the matching hole, and the other end of the connecting rod is fixedly connected to the pre-compression block.

[0025] Preferably, the elastic component includes a plug arranged in the mounting hole, and a second elastic member arranged between the plug and the connector, and the second elastic member applies elastic force to the connector.

[0026] Preferably, a bag-pulling convex mold and a bag-pulling concave mold are provided at the bag-pulling station, the bag-pulling convex mold comprises a pressing boss and a deformation groove arranged on the outside of the bag-pulling boss, the middle of the upper end surface of the bag-pulling concave mold is recessed to form a bag-pulling groove, and the bag-pulling groove comprises a first bag-pulling groove and a second bag-pulling groove arranged on the bottom surface of the first bag-pulling groove;

[0027] Step S2 also includes the stretching and forming of the step portion of the top cover sheet body: the blank is transferred to the stretching station, the blank is placed in the first stretching groove, the stretching punch is abutted against the blank and pressed toward the second stretching groove, so that the middle part of the lower end surface of the blank located in the forming area is stretched toward the second stretching groove so that it sinks as a whole to form the lower end surface of the steel top cover sheet, and at the same time, a step portion connected to the blanking area is formed at the edge of the lower end surface of the blank located in the forming area. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is an overall top view of the metal strip at each work station of the present invention;

[0029] Figure 2 It is a cross-sectional view of the blank area of ​​the present invention at the bag-drawing station;

[0030] Figure 3 for Figure 2 A partial enlarged view of the box;

[0031] Figure 4 for Figure 3 A partial enlarged view of the circle;

[0032] Figure 5 It is a cross-sectional view of the blank area of ​​the present invention at the side thrust mechanism;

[0033] Figure 6 for Figure 5 A partial enlarged view of the box in the middle;

[0034] Figure 7 for Figure 6 A partial enlarged view of the circle;

[0035] Figure 8 It is a side view of the blank area of ​​the present invention at the side push mechanism;

[0036] Fig. 9 A top view of the steel roof cover product of the present invention;

[0037] Fig.10 for Fig. 9 Section view at section line AA;

[0038] Fig.11 for Fig.10 A partial enlarged view of the circle;

[0039] Illustration: 100, metal strip; 101, steel top cover sheet; 101.1, step portion; 102, blank; 102.1, forming area; 102.2, blanking area; 103, annular boss; 1, pre-trimming station; 2, bag drawing station; 3, side push station; 4, outer trimming station; 5, bag drawing punch; 5.2, pressing boss; 6, bag drawing die; 6.1, bag drawing groove; 6.1.1, first bag drawing groove; 6.1.2, second bag drawing groove; 7, side push mechanism; 7.1, fixing Plate; 7.1.1, mounting hole; 7.1.2, matching hole; 7.2, movable plate; 7.3, side push die; 7.31, placement surface; 7.4, bevel block; 7.5, slide rail; 7.6, side push block; 7.7, reset structure; 7.7.1, stopper; 7.7.2, first elastic member; 7.8, pre-compression block; 7.9, elastic component; 7.9.1, plug; 7.9.2, second elastic member; 7.11, connecting rod; 7.11.1, rod body; 7.11.2, connector. DETAILED DESCRIPTION

[0040] 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.

[0041] 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.

[0042] 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.

[0043] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0044] Please refer to Figure 1 The forming structure includes a pre-trimming station 1, a bag pulling station 2, a side pushing station 3, and an outer trimming station 4. The specific pre-trimming station 1 and the outer trimming station 4 can be a common punching or other cutting mechanism to form the outer edge.

[0045] Please refer to Figures 2 to 4 The specific bag drawing station 2 includes a bag drawing male die 5 and a bag drawing female die 6. The bag drawing male die 5 has a pressing boss 5.2 and a deformation groove located at the edge of the pressing boss 5.2, and the bag drawing female die 6 has a bag drawing groove 6.1 in the middle of the upper end surface, and the bag drawing groove 6.1 is divided into a first bag drawing groove 6.1.1 and a second bag drawing groove 6.1.2.

[0046] Please refer to Figures 5 to 7 The side push station 3 includes a side push mechanism 7, which is composed of a fixed plate 7.1, a movable plate 7.2 and a side push die 7.3. The upper end surface of the side push die 7.3 has a placement surface 7.31 for placing the blank 102. The lower end of the fixed plate 7.1 has a bevel block 7.4, and the lower end of the bevel block 7.4 has a driving inclined surface. The movable plate 7.2 has a slide rail 7.5, and the slide rail 7.5 has a side push block 7.6 corresponding to the driving inclined surface of the bevel block 7.4.

[0047] The side push mechanism 7 is also provided with a reset structure 7.7, including a stopper 7.7.1 and a first elastic member 7.7.2. The stopper 7.7.1 is arranged on the movement path of the side push block 7.6, and the first elastic member 7.7.2 is installed between the stopper 7.7.1 and the side push block 7.6, and is used to apply elastic force to the side push block 7.6 to return it to its initial position.

[0048] A pre-pressing block 7.8 and an elastic component 7.9 are also provided at the side push station 3. The pre-pressing block 7.8 is connected to the fixed plate 7.1 by sliding up and down through a connecting rod 7.11, and the elastic component 7.9 drives the pre-pressing block 7.8 to press against the placement surface 7.31.

[0049] The structure of the connecting rod 7.11 includes a rod body 7.11.1 and a connector 7.11.2. The rod body 7.11.1 is slidably connected to the matching hole 7.1.2 on the fixing plate 7.1. The connector 7.11.2 is placed on the mounting hole 7.1.1. The other end of the connecting rod 7.11 is fixedly connected to the pre-pressing block 7.8.

[0050] The structure of the elastic component 7.9 comprises a plug 7.9.1 arranged in the mounting hole 7.1.1 and a second elastic member 7.9.2 arranged between the plug 7.9.1 and the connector 7.11.2, and the second elastic member 7.9.2 applies elastic force to the connector 7.11.2.

[0051] A method for forming a step shape of a steel roof sheet comprises the following steps:

[0052] Step S1, after the metal strip 100 passes through the pre-trimming station 1, a blank 102 having a forming area 102.1 and a blanking area 102.2 is punched out on the metal strip 100;

[0053] Step S2, the blank 102 is transferred to the bag drawing die 6 at the bag drawing station 2, and the pressing boss 5.2 on the bag drawing punch 5 applies a pressing force to the blank 102, so that the portion between the forming area 102.1 and the blanking area 102.2 of the blank 102 extends into the groove located at the outer edge of the pressing boss 5.2 on the bag drawing punch 5 to form an annular boss 103;

[0054] Step S2 also includes the stretching and forming of the step portion 101.1 of the top cover sheet body: the blank 102 is transferred to the stretching station 2, the blank 102 is placed in the first stretching groove 6.1.1, the stretching punch 5 is abutted against the blank 102 and pressed toward the second stretching groove 6.1.2, so that the middle part of the lower end surface of the blank 102 located in the forming area 102.1 is stretched toward the second stretching groove 6.1.2 so that it sinks as a whole to form the lower end surface of the steel top cover sheet 101, and at the same time, a step portion 101.1 connected to the blanking area 102.2 is formed at the edge of the lower end surface of the forming area 102.1 of the blank 102.

[0055] Step S3, the blank 102 is transferred to the side push station 3, and the side push mechanism 7 applies pressure to the annular boss 103, so that the annular boss 103 is translated toward the blanking area 102.2 until it completely falls into the blanking area 102.2, and at the same time, a smooth and complete upper surface of the steel top cover sheet 101 is formed in the forming area 102.1;

[0056] Wherein step S3 comprises:

[0057] Step S31, driving the movable plate 7.2 to move toward the blank 102 until the lower end surface of the side push block 7.6 is in contact with the upper surface of the forming area 102.1 of the blank 102;

[0058] Step S32, driving the fixed plate 7.1 to drive the driving inclined surface of the bevel block 7.4 to apply thrust to the side push block 7.6, so that the side push block 7.6 moves along the slide rail 7.5 to the lower part of its side surface against the annular boss 103;

[0059] In step S33, the lower side portion of the side push block 7.6 applies pressure to the inner wall of the annular boss 103, so that the annular boss 103 as a whole moves toward the blanking area 102.2 along with the movement of the bevel block 7.4 until it completely falls into the blanking area 102.2, and at the same time forms a smooth and complete upper surface of the steel top cover sheet 101 in the forming area 102.1.

[0060] Step S4, conveying the blank 102 to the outer shape trimming station 4, blanking the connection between the forming area 102.1 and the blanking area 102.2, so that the forming area 102.1 forms the steel top cover sheet 101, and the blanking area 102.2 is separated from the steel top cover sheet 101.

[0061] 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 method for forming a step shape of a steel roof sheet, characterized in that: The steps include: Step S1, after the metal strip (100) passes through the pre-trimming station (1), a blank (102) having a forming area (102.1) and a blanking area (102.2) is punched out on the metal strip (100); Step S2, transferring the blank (102) to the bag drawing die (6) at the bag drawing station (2), and applying a pressing force to the blank (102) by a pressing boss (5.2) on the bag drawing punch (5), so that a portion between the forming area (102.1) and the blanking area (102.2) of the blank (102) extends into a groove located at the outer edge of the pressing boss (5.2) on the bag drawing punch (5) to form an annular boss (103); Step S3, the blank (102) is transferred to the side push station (3), and the side push mechanism (7) applies pressure to the annular boss (103), so that the annular boss (103) is translated toward the blanking area (102.2) until it completely falls into the blanking area (102.2), and at the same time, a smooth and complete upper surface of the steel top cover sheet (101) is formed in the forming area (102.1); Step S4, transferring the blank (102) to the outer shape trimming station (4), blanking the connection between the forming area (102.1) and the blanking area (102.2), so that the forming area (102.1) forms a steel top cover sheet (101), and the blanking area (102.2) is separated from the steel top cover sheet (101).

2. The method for forming a steel roof sheet with a stepped shape according to claim 1, characterized in that: The side-pushing station (3) is provided with a side-pushing mechanism (7), the side-pushing mechanism (7) comprising a fixed plate (7.1), a movable plate (7.2), and a side-pushing die (7.3); the upper end surface of the side-pushing die (7.3) has a placement surface (7.31) for placing a blank (102); a bevel block (7.4) is installed at the lower end of the fixed plate (7.1); a driving bevel is provided at the lower end of the bevel block (7.4); a slide rail (7.5) is arranged from the forming area (102.1) toward the blanking area (102.2) on the movable plate (7.2); and a side-pushing block (7.6) corresponding to the driving bevel on the bevel block (7.4) is provided on the slide rail (7.5); Wherein step S3 comprises: Step S31, driving the movable plate (7.2) to move toward the blank (102) until the lower end surface of the side push block (7.6) is in contact with the upper surface of the forming area (102.1) of the blank (102); Step S32, driving the fixed plate (7.1) to drive the driving inclined surface of the bevel block (7.4) to apply thrust to the side push block (7.6), so that the side push block (7.6) moves along the slide rail (7.5) to the lower part of its side surface against the annular boss (103); Step S33, the lower side of the side push block (7.6) applies pressure to the inner wall of the annular boss (103), so that the annular boss (103) as a whole moves toward the blanking area (102.2) along with the movement of the bevel block (7.4) until it completely falls into the blanking area (102.2), and at the same time, a smooth and complete upper surface of the steel top cover sheet (101) is formed in the forming area (102.1).

3. The method for forming a steel roof sheet with a stepped shape according to claim 2, characterized in that: The side thrust mechanism (7) further comprises a reset structure (7.7), wherein the reset structure (7.7) comprises a stopper (7.7.1) arranged at the movement path of the side thrust block (7.6), a first elastic member (7.7.2) being installed between the stopper (7.7.1) and the end surface of the side thrust block (7.6) facing the inner side wall, and the first elastic member (7.7.2) exerts an elastic force on the side thrust block (7.6) so that the side thrust block (7.6) moves in the direction opposite to the inner side wall to an initial position.

4. The method for forming a steel roof sheet with a step shape according to claim 3, characterized in that: The side push station (3) is also provided with a pre-pressing block (7.8) and an elastic component (7.9). The pre-pressing block (7.8) is connected to the fixed plate (7.1) by a connecting rod (7.11) so as to slide up and down. The elastic component (7.9) drives the pre-pressing block (7.8) to press toward the placement surface (7.31).

5. The method for forming a steel roof sheet with a step shape according to claim 4, characterized in that: The connecting rod (7.11) comprises a rod body (7.11.1) and a connecting head (7.11.2) arranged at one end of the rod body (7.11.1); the fixing plate (7.1) is provided with a mounting hole (7.1.1) and a matching hole (7.1.2) arranged from top to bottom; the rod body (7.11.1) and the matching hole (7.1.2) are connected by sliding up and down; the connecting head (7.11.2) rests on the connecting end surface of the mounting opening and the matching hole (7.1.2); the other end of the connecting rod (7.11) is fixedly connected to the pre-pressing block (7.8).

6. The method for forming a step shape of a steel roof sheet according to claim 5, characterized in that: The elastic component (7.9) comprises a plug (7.9.1) arranged in the mounting hole (7.1.1), and a second elastic member (7.9.2) arranged between the plug (7.9.1) and the connector (7.11.2), wherein the second elastic member (7.9.2) applies elastic force to the connector (7.11.2).

7. The method for forming a steel roof sheet with a stepped shape according to claim 1, characterized in that: The bag drawing station (2) is provided with a bag drawing convex mold (5) and a bag drawing concave mold (6), the bag drawing convex mold (5) comprises a pressing boss (5.2) and a deformation groove arranged on the outside of the bag drawing boss, the middle of the upper end surface of the bag drawing concave mold (6) is recessed to form a bag drawing groove (6.1), and the bag drawing groove (6.1) comprises a first bag drawing groove (6.1.1) and a second bag drawing groove (6.1.2) arranged on the bottom surface of the first bag drawing groove (6.1.1); Step S2 also includes the step forming of the step portion (101.1) of the top cover sheet body: the blank (102) is transferred to the drawing station (2), the blank (102) is placed in the first drawing groove (6.1.1), the drawing punch (5) is pressed against the blank (102) and pressed toward the second drawing groove (6.1.2), so that the middle part of the lower end surface of the blank (102) located in the forming area (102.1) is stretched toward the second drawing groove (6.1.2) so that the whole part sinks to form the lower end surface of the steel top cover sheet (101), and at the same time, a step portion (101.1) connected to the blanking area (102.2) is formed at the edge of the lower end surface of the blank (102) located in the forming area (102.1).

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