Battery steel shell stamping die

Abstract

This utility model discloses a battery steel shell stamping die, including an upper cutter, a lower cutter, an upper ejector core, and a lower ejector core. The lower cutter includes a cutter seat and a lower ejector component. The upper cutter, the cutter seat, and the lower ejector component are all sleeve structures. The upper cutter is located above the lower cutter. The upper ejector core is movably inserted into the upper cutter, the lower ejector component is movably inserted into the cutter seat, and the lower ejector core is movably inserted into the lower ejector component. A boss extends downward from the center of the bottom surface of the upper ejector core, and a clearance hole is provided on the lower ejector core. With this battery steel shell stamping die, the bottom surface of the stamped steel shell is concave inward under the pressure of the boss and the clearance hole. The steel shell blank is supported by the annular edge of the bottom surface, resulting in a small contact area with tooling such as conveyor belts, slides, or material baskets, thus minimizing wear resistance and friction damage.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, and in particular to a stamping mold for a battery steel shell. Background Technology

[0002] The manufacturing process of battery steel casings typically includes multiple steps such as steel strip punching, stamping, trimming, cleaning, electroplating, and annealing. Stamping is performed by a stamping die, completing deep drawing and bottom surface shaping in one operation. Battery steel casing stamping dies, as disclosed in Chinese patent application CN202420881747.1, consist of a trimming assembly and a stretching assembly working in tandem. In existing steel casing stamping dies, the bottom of the stamped steel casing blank is generally flat or a highly curved spherical surface. When the stamped steel casing blank is transferred, temporarily stored, or enters the pre-plating treatment station, the bottom surface of this geometrically shaped blank easily forms direct contact and relative sliding with tooling such as conveyor belts, slides, or material baskets. This results in a large contact area and high friction. Furthermore, during belt start-stop, turning, or stacking operations, hard particles (metal shavings, dust) are easily trapped in the contact surface, producing linear or mesh-like scratches.

[0003] These scratches not only result in poor appearance after electroplating, but also create stress concentration at the root, becoming a source of cracks in subsequent grooving and sealing processes, reducing the explosion-proof pressure of the steel shell. Simultaneously, scratches disrupt the continuity of the plating layer, easily inducing pitting corrosion, weakening the battery's sealing performance, and ultimately leading to a decrease in yield. To alleviate this problem, the industry commonly adopts measures such as attaching felt or soft rubber pads to the conveyor belt surface, reducing conveying speed, or adding independent cleaning and polishing stations. However, felt has poor wear resistance and easily absorbs dust, causing secondary pollution; reducing speed directly sacrifices production capacity; and adding new polishing equipment involves high investment and may introduce new surface damage. Utility Model Content

[0004] The purpose of this utility model is to provide a stamping die for a battery steel shell.

[0005] The technical solution to achieve the purpose of this utility model is: a battery steel shell stamping die, including an upper cutter, a lower cutter, an upper ejector core, and a lower ejector core. The lower cutter includes a cutter holder and a lower ejector. The upper cutter, the cutter holder, and the lower ejector are all sleeve structures. The upper cutter is located above the lower cutter. The upper ejector core is movably inserted into the upper cutter. The lower ejector is movably inserted into the cutter holder. The lower ejector core is movably inserted into the lower ejector. The upper cutter, the cutter seat, the lower top member, the upper top core, and the lower top core are all coaxial. The outer diameter of the lower part of the upper cutter is the same as the inner diameter of the upper part of the cutter seat. The inner diameter of the lower part of the upper cutter is slightly larger than the outer diameter of the lower top core. A boss extends downward from the center of the bottom surface of the upper top core. A clearance hole is provided on the lower top core. The clearance hole is located directly below the boss. The diameter of the upper part of the clearance hole is slightly larger than the width of the boss.

[0006] Furthermore, the outer diameter of the upper part of the lower pusher is the same as the inner diameter of the upper part of the cutter seat. The outer diameter of the upper part of the lower pusher can be the same as the inner diameter of the upper part of the cutter seat, or it can be smaller than the inner diameter of the upper part of the cutter seat. Compared with the latter, the former has a larger pressing surface when the lower pushers abut against each other, resulting in a more secure clamping of the cut steel sheet.

[0007] Furthermore, the inner diameter of the lower support member is the same as the outer diameter of the lower support core. The outer diameter of the lower support core can be the same as or smaller than the inner diameter of the lower support member. Compared to the latter, with the former size, the lower support member can guide the lifting and lowering movement of the lower support core, making the operation of the lower support core more stable and reliable.

[0008] Furthermore, the outer diameter of the upper top core is the same as the outer diameter of the lower top core. The outer diameter of the upper top core can be larger than the outer diameter of the lower top core, and be consistent with the inner diameter of the lower part of the upper cutter; the outer diameter of the upper top core can also be consistent with the outer diameter of the lower top core; the outer diameter of the upper top core can also be smaller than the outer diameter of the lower top core. Compared with others, since the bottom surface of the steel blank is formed when the upper surface of the lower top core is stamped, when the outer diameter of the upper top core is consistent with the outer diameter of the lower top core, the bottom surface area of ​​the upper top core is consistent with that of the steel blank, which can completely cover the bottom surface of the steel blank and press it. The bottom surface of the steel blank can be subjected to more uniform force, resulting in a better surface quality of the bottom surface of the steel blank.

[0009] Furthermore, the central hole of the cutter holder is a stepped hole that is narrower at the top and wider at the bottom. The lower end of the lower push member extends radially outward with a bottom cap edge. The outer diameter of the bottom cap edge is larger than the inner diameter of the upper part of the cutter holder, and the bottom cap edge is located within the lower hole of the cutter holder. The bottom cap edge engages with the lower hole of the cutter holder to limit the upward movement of the lower push member, preventing it from detaching from the cutter holder during its upward movement, thus making the structure more reliable.

[0010] Furthermore, the central hole of the upper cutter is a stepped hole, wider at the top and narrower at the bottom. A top cap extends radially outward from the upper end of the upper ejector core. The outer diameter of the top cap is larger than the inner diameter of the lower part of the upper cutter, and the top cap is located within the upper hole of the upper cutter. The top cap engages with the upper hole of the upper cutter to limit the downward movement of the upper ejector core. When the upper ejector core moves downward to eject the steel blank stamped within the upper cutter for demolding, the maximum downward stroke of the upper ejector core is limited, preventing the upper ejector core from exiting the upper cutter. When the top cap contacts the stepped wall of the central hole of the upper cutter, the lower end of the upper ejector core extends outside the upper cutter. Compared to a drive-based limiting mechanism, this structure provides more reliable limiting and more stable operation of the upper ejector core.

[0011] Furthermore, the boss is a frustum of a cone, and the clearance hole is a circular hole. The boss and the upper top core, and the clearance hole and the lower top core are coaxial. When the boss is a frustum of a cone, the bottom concave surface of the stamped steel blank is also circular, the same as the bottom surface of the steel blank, and the circumferential concave portion of the steel blank is more regular and balanced.

[0012] Furthermore, the thickness of the boss is 0.05~0.3mm.

[0013] Furthermore, the relief hole is a through hole. With the through hole structure, when the boss and the relief hole cooperate to punch a depression on the bottom surface of the steel shell blank, the air pressure inside and outside the relief hole can be more balanced, and there is no pressure difference inside and outside the relief hole, which is more conducive to the boss punching into the relief hole.

[0014] This utility model relates to a battery steel shell stamping die. Through the arrangement of the upper cutter, lower cutter, upper ejector core, and lower ejector core, and utilizing the misalignment of the cutter holders of the upper and lower cutters, the steel sheet is cut simultaneously. While the lower ejector components of the upper and lower cutters clamp the periphery of the steel sheet, the upper and lower ejector cores stamp the steel sheet, ultimately forming a steel shell blank. This utility model of a battery steel shell stamping die integrates cutting and stamping functions. The equipment is simple and compact, completing cutting and stamping in one operation, resulting in high work efficiency.

[0015] This utility model of battery steel shell stamping die further utilizes a boss extending downward from the center of the bottom surface of the upper top core, and a clearance hole provided on the lower top core. This causes the bottom surface of the stamped steel shell to be concave inward under the pressure of the boss and the clearance hole, ultimately forming a steel shell bottom surface with a concave center. Whether the steel shell blank is placed or transported, due to the concave center of the bottom surface, the steel shell blank is supported by the annular edge of the bottom surface. The contact area between the steel shell blank supported only by the annular edge and tooling such as conveyor belts, slides, or material baskets is small. Compared to the traditional support structure where the entire bottom surface is in contact, this greatly reduces the contact area, reduces wear resistance and friction damage during contact, significantly improves the yield of battery steel shells, and fundamentally avoids the generation of scratches on the surface of the steel shell blank, significantly reducing scrap and rework rates. Simultaneously, the improved surface quality also reduces the number of rework and scrap items, improves production efficiency and product consistency, and effectively reduces overall production costs. Attached Figure Description

[0016] Figure 1 This is a three-dimensional assembly structure diagram of the battery steel shell stamping die from a first-person perspective. Figure 2 This is a three-dimensional assembly structure diagram of the battery steel shell stamping die of this utility model from a second perspective. Figure 3 This is a schematic diagram of the assembly structure of the battery steel shell stamping die of this utility model from the front view. Figure 4 This is a schematic diagram of the main structure of the battery steel shell stamping die of this utility model; Figure 5 yes Figure 4 Schematic diagram of the cross-sectional structure along line AA; Figure 6 yes Figure 5 A magnified structural diagram of part B in the middle; Figure 7 This is a three-dimensional structural diagram of the upper core of the battery steel shell stamping die of this utility model; Figure 8 This is a cross-sectional structural diagram of the steel shell blank formed by the battery steel shell stamping die of this utility model. Detailed Implementation

[0017] The preferred embodiment of the battery steel shell stamping die of this utility model will be described in detail below with reference to the accompanying drawings: like Figures 1 to 7As shown, a battery steel casing stamping die includes an upper cutter 1, a lower cutter 2, an upper ejector core 3, and a lower ejector core 4. The lower cutter 2 includes a cutter holder 21 and a lower ejector 22. The upper cutter 1, the cutter holder 21, and the lower ejector 22 are all sleeve structures. The upper cutter 1 is located above the lower cutter 2. The upper ejector core 3 is movably inserted into the upper cutter 1. The lower ejector core 22 is movably inserted into the cutter holder 21. The lower ejector core 4 is movably inserted into the lower ejector core 22. The upper cutter 1, the cutter holder 21, and the lower ejector core 4 are all sleeve structures. The lower top member 22, the upper top core 3, and the lower top core 4 are all coaxial. The outer diameter D1a of the lower part of the upper cutter 1 is the same as the inner diameter D21 of the upper part of the cutter seat 21. The inner diameter D1b of the lower part of the upper cutter 1 is slightly larger than the outer diameter D4 of the lower top core 4. A boss 31 extends downward from the middle of the bottom surface of the upper top core 3. A clearance hole 41 is provided on the lower top core 4. The clearance hole 41 is located directly below the boss 31. The diameter D41 of the upper part of the clearance hole 41 is slightly larger than the width D31 of the boss 31.

[0018] This utility model relates to a battery steel shell stamping die. The upper cutter 1 and the lower cutter 2 cooperate to cut steel strip into steel sheets. The lower cutter 2 includes a cutter holder 21 and a lower ejector 22. The cutter holder 21 is offset from the upper cutter 1. The outer diameter D1a of the lower part of the upper cutter 1 and the inner diameter D21 of the upper part of the cutter holder 21 are the same, forming a cutter. The lower ejector 22 is opposite to the lower cutter 2. The lower ejector 22 abuts against the lower cutter 2, assisting in cutting and also clamping the cut steel sheets for stamping. The upper ejector core 3 and the lower ejector core 4 are opposite to each other and are used to stamp the steel sheets clamped between the lower ejector core 22 and the lower cutter 2. The upper ejector core 3 is also used to demold the steel shell blank formed by stamping within the upper cutter 1.

[0019] This utility model relates to a battery steel shell stamping die. The inner diameter D1b of the lower part of the upper cutter 1 is slightly larger than the outer diameter D4 of the lower ejector core 4. A small first gap exists between the upper cutter 1 and the upper ejector core 3 extending into the upper cutter 1. This first gap is consistent with the thickness of the steel shell blank after stamping, reserving space for the thickness of the steel shell blank during the stamping process. The boss 31 and the relief hole 41 are arranged opposite each other to form a recess on the bottom surface of the steel shell blank. The diameter D41 of the upper part of the relief hole 41 is slightly larger than the width D31 of the boss 31. A small second gap exists between the relief hole 41 and the boss 31 extending into the relief hole 41. This second gap is consistent with the thickness of the steel shell blank after stamping, reserving space for the thickness of the steel shell blank during the stamping process.

[0020] This utility model relates to a battery steel shell stamping die. During operation, a steel strip is fed in and positioned between the upper cutter 1 and the lower cutter 2. The upper cutter 1 and its internal upper ejector core 3 descend as a whole, abutting against the lower cutter 2 and the lower ejector core 4. Then, the upper cutter 1, the upper ejector core 3, the lower ejector part 22 of the lower cutter 2, and the lower ejector core 4 clamp the steel strip, and the whole assembly continues to descend. During this descent, the upper cutter 1 enters the cutter holder 21, and the upper cutter 1 and the cutter holder 21 are misaligned, cutting the steel strip to form a circular steel sheet. Afterwards, the upper cutter 1, the upper ejector core 3, the lower ejector part 22 of the lower cutter 2, and the lower ejector core 4 clamp the steel strip. The top core 3, the lower pusher 22 of the lower cutter 2, and the lower top core 4 clamp the steel sheet and move upward as a whole until the lower pusher 22 and the upper surface of the cutter seat 21 are flush. Then, the upper cutter 1 and the lower pusher 22 of the lower cutter 2 stop, statically clamping the periphery of the steel sheet. The upper top core 3 and the lower top core 4 then clamp the middle of the steel sheet and continue moving upward. The lower top core 4 extends into the upper cutter 1 to stamp the steel sheet, forming a steel shell blank 100. During the stamping process, the boss 31 presses the steel sheet into the relief hole 41, causing the bottom surface of the steel shell blank 100 to form a concave structure 101, such as... Figure 8 As shown. After the steel shell blank is formed, the lower top core 4 moves downward and resets, while the lower cutter 2 moves upward relative to the upper top core 3. At the same time as resetting, the upper top core 3 pushes the steel shell blank inside the lower cutter 2 out of the mold for demolding.

[0021] In this utility model, a battery steel shell stamping die is presented. The upper cutter 1, the lower ejector 22 of the lower cutter 2, the upper ejector core 3, and the lower ejector core 4 can all be driven to rise and fall by a drive mechanism (not shown in the figure). The drive mechanism for the rising and falling motion in the die is usually a hydraulic cylinder or a punch. The die rising and falling and the driving mechanism for rising and falling are existing solutions, and will not be elaborated further in this utility model.

[0022] This utility model relates to a battery steel shell stamping die. Through the arrangement of the upper cutter 1, the lower cutter 2, the upper ejector core 3, and the lower ejector core 4, and utilizing the misalignment of the cutter holders 21 of the upper cutter 1 and the lower cutter 2, the steel sheet is cut simultaneously. While the lower ejector parts 22 of the upper cutter 1 and the lower cutter 2 clamp the periphery of the steel sheet, the upper ejector core 3 and the lower ejector core 4 stamp the steel sheet, ultimately forming a steel shell blank. This utility model of a battery steel shell stamping die integrates cutting and stamping functions. The equipment is simple and compact, completing cutting and stamping in one operation, resulting in high work efficiency.

[0023] This utility model of battery steel shell stamping die further utilizes a boss 31 extending downward from the center of the bottom surface of the upper top core 3, and a clearance hole 41 provided on the lower top core 4. This causes the bottom surface of the stamped steel shell to be concave inward under the pressure of the boss 31 and the clearance hole 41, ultimately forming a concave bottom surface. Whether the steel shell blank is placed or transported, due to the concave bottom surface, the blank is supported by its annular edge. The contact area between the blank and tooling such as the conveyor belt, slide, or material basket is small, significantly reducing the contact area compared to traditional support structures where the entire bottom surface is in contact. This reduces wear resistance and friction damage during contact, greatly improving the yield rate of battery steel shells and fundamentally preventing surface scratches on the steel shell blank, significantly reducing scrap and rework rates. Simultaneously, the improved surface quality reduces rework and scrap, increasing production efficiency and product consistency, and effectively lowering overall production costs.

[0024] In this utility model of a battery steel shell stamping die, preferably, the outer diameter D22a of the upper part of the lower ejector 22 and the inner diameter D21 of the upper part of the cutter seat 21 are the same. The outer diameter D22a of the upper part of the lower ejector 22 can be the same as or smaller than the inner diameter D21 of the upper part of the cutter seat 21. Compared to the latter, the former provides a larger pressing surface when the lower ejector 22 abuts against the other lower ejector 22, resulting in a more secure clamping of the cut steel sheet.

[0025] In this utility model of battery steel shell stamping die, preferably, the inner diameter D22b of the lower ejector 22 and the outer diameter D4 of the lower ejector core 4 are the same. The outer diameter D4 of the lower ejector core 4 can be the same as or smaller than the inner diameter D22b of the lower ejector 22. Compared to the latter, with the former size, the lower ejector 22 can guide the lifting and lowering movement of the lower ejector core 4, making the operation of the lower ejector core 4 more stable and reliable.

[0026] In this utility model of battery steel shell stamping die, preferably, the outer diameter D3 of the upper ejector core 3 and the outer diameter D4 of the lower ejector core 4 are the same. The outer diameter D3 of the upper ejector core 3 can be larger than the outer diameter D4 of the lower ejector core 4, and be consistent with the inner diameter D1b of the lower part of the upper cutter 1; the outer diameter D3 of the upper ejector core 3 can also be consistent with the outer diameter D4 of the lower ejector core 4; the outer diameter D3 of the upper ejector core 3 can also be smaller than the outer diameter D4 of the lower ejector core 4. Compared to others, when the upper surface of the lower top core 4 is stamped onto the steel shell blank, the bottom surface of the steel shell blank is formed accordingly. When the outer diameter D3 of the upper top core 3 and the outer diameter D4 of the lower top core 4 are consistent, the bottom surface area of ​​the upper top core 3 is consistent with that of the steel shell blank, which can completely cover the bottom surface of the steel shell blank and press it down. The bottom surface of the steel shell blank can be subjected to more uniform force, resulting in a better surface quality of the bottom surface of the formed steel shell blank.

[0027] In this utility model of a battery steel shell stamping die, preferably, the central hole 211 of the cutter holder 21 is a stepped hole that is narrower at the top and wider at the bottom. The lower end of the lower ejector 22 extends radially outward with a bottom cap 221. The outer diameter D221 of the bottom cap 221 is larger than the inner diameter D21 of the upper part of the cutter holder 21. The bottom cap 221 is located within the lower hole of the cutter holder 21. The bottom cap 221 engages with the lower hole of the cutter holder 21 to limit the upward movement of the lower ejector 22, preventing it from dislodging from the cutter holder 21 during its upward movement, thus improving structural reliability.

[0028] In this utility model of a battery steel shell stamping die, preferably, the center hole 11 of the upper cutter 1 is a stepped hole that is wider at the top and narrower at the bottom. A top cap 32 extends radially outward from the upper end of the upper ejector core 3. The outer diameter D32 of the top cap 32 is larger than the inner diameter D1b of the lower part of the upper cutter 1. The top cap 32 is located inside the upper hole of the upper cutter 1. The top cap 32 engages with the upper hole of the upper cutter 1 to limit the downward movement of the upper ejector core 3. When the upper ejector core 3 moves downward to eject the steel shell blank stamped inside the upper cutter 1, the maximum downward stroke of the upper ejector core 3 is limited, preventing the upper ejector core 3 from exiting the upper cutter 1. When the top cap 32 contacts the stepped wall 111 of the center hole 11 of the upper cutter 1, the lower end of the upper ejector core 3 extends outside the upper cutter 1. Compared to drive-driven limiting, this structural limiting is more reliable, and the operation of the upper top core 3 is more stable.

[0029] In this utility model of battery steel shell stamping die, preferably, the boss 31 is a frustum of a cone, and the clearance hole 41 is a circular hole. The boss 31 is coaxial with the upper ejector core 3, and the clearance hole 41 is coaxial with the lower ejector core 4. When the boss 31 is a frustum of a cone, the bottom concavity of the stamped steel shell blank is also circular, the same as the bottom surface of the steel shell blank, and the circumferential concave part of the steel shell blank is more regular and balanced.

[0030] In this utility model of battery steel shell stamping die, preferably, the thickness of the boss 31 is 0.05~0.3mm. If the thickness of the boss 31 is too small, the effect will be poor; if it is too deep, it may affect the structural strength of the steel shell.

[0031] In this utility model of battery steel shell stamping die, preferably, the relief hole 41 is a through hole. With the through hole structure, when the boss 31 cooperates with the relief hole 41 to stamp a recess on the bottom surface of the steel shell blank, the air pressure inside and outside the relief hole 41 can be more balanced, and there is no pressure difference between the inside and outside of the relief hole 41, which is more conducive to the stamping of the boss 31 into the relief hole 41.

[0032] For those skilled in the art to which this utility model pertains, several simple deductions or substitutions can be made without departing from the concept of this utility model, and all such deductions or substitutions should be considered to fall within the protection scope of this utility model.

Claims

1. A stamping die for a battery steel casing, characterized in that: The device includes an upper cutter, a lower cutter, an upper top core, and a lower top core. The lower cutter includes a cutter holder and a lower top component. The upper cutter, the cutter holder, and the lower top component are all sleeve structures. The upper cutter is located above the lower cutter. The upper top core is movably inserted into the upper cutter, the lower top component is movably inserted into the cutter holder, and the lower top core is movably inserted into the lower top component. The upper cutter, the cutter holder, the lower top component, the upper top core, and the lower top core are all coaxial. The outer diameter of the lower part of the upper cutter is the same as the inner diameter of the upper part of the cutter holder. The inner diameter of the lower part of the upper cutter is slightly larger than the outer diameter of the lower top core. A boss extends downward from the center of the bottom surface of the upper top core. A clearance hole is provided on the lower top core. The clearance hole is located directly below the boss, and the diameter of the upper part of the clearance hole is slightly larger than the width of the boss.

2. The battery steel casing stamping die according to claim 1, characterized in that: The outer diameter of the upper part of the lower top member is the same as the inner diameter of the upper part of the cutter seat.

3. The battery steel casing stamping die according to claim 1, characterized in that: The inner diameter of the lower top component is the same as the outer diameter of the lower top core.

4. The battery steel casing stamping die according to claim 1, characterized in that: The outer diameter of the upper top core is the same as the outer diameter of the lower top core.

5. The battery steel casing stamping die according to claim 1, characterized in that: The center hole of the cutter holder is a stepped hole that is narrower at the top and wider at the bottom. The lower end of the lower top member extends radially outward with a bottom cap edge. The outer diameter of the bottom cap edge is larger than the inner diameter of the upper part of the cutter holder. The bottom cap edge is located inside the lower hole of the cutter holder.

6. The battery steel casing stamping die according to claim 1, characterized in that: The center hole of the upper cutter is a stepped hole that is wider at the top and narrower at the bottom. The upper end of the upper top core extends radially outward with a top cap edge. The outer diameter of the top cap edge is larger than the inner diameter of the lower part of the upper cutter. The top cap edge is located inside the upper hole of the upper cutter.

7. The battery steel casing stamping die according to claim 1, characterized in that: The boss is a frustum, and the clearance hole is a round hole.

8. The battery steel casing stamping die according to claim 1, characterized in that: The thickness of the boss is 0.05~0.3mm.

9. The battery steel casing stamping die according to claim 1, characterized in that: The clearance hole is a through hole.

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