A mold facilitating demolding

Abstract

The application relates to the technical field of molds, and discloses a mold facilitating demolding, which comprises a mold handle, a punch insert block arranged on the mold handle, and a front ejector block slidingly arranged in the punch insert block. A control member is arranged in the mold handle, and the control member is used for driving the front ejector block to slide. The sliding path of the front ejector block and the moving path of the mold handle are on the same straight line. The front ejector block is used for pushing in the inside of a hollow electrode, the demolding force borne by the mold is dispersed, the possibility of excessive local stress of the mold is reduced, and the mold is protected from being damaged.

Description

Technical Field

[0001] This application relates to the technical field of molds, and in particular to a mold that is easy to demold. Background Technology

[0002] In existing battery structures, electrodes are typically designed as short, solid cylindrical or sheet-like structures. Their limited length makes it difficult to achieve sufficient and reliable physical contact and electrical connection with external conductive components such as busbars and current collectors during battery module integration, affecting system assembly efficiency and connection stability. To improve this problem, the industry commonly uses increasing the axial length of the electrode to expand the connection interface. Longer electrodes mean that a single cell can accommodate more active material, thereby increasing the capacity of a single battery cell. However, electrode materials often use highly conductive copper or copper alloys, which are significantly more expensive than other metal materials. Increasing the electrode length leads to a linear increase in material usage and cost, which is detrimental to product economics. Therefore, the industry has proposed designing electrodes with hollow structures to reduce material usage and achieve cost and weight reduction. However, the manufacturing process of hollow electrodes, especially the forming of hollow electrodes with a large aspect ratio, still faces significant technical challenges.

[0003] Currently, the manufacturing of hollow electrodes mainly relies on in-mold forming technology. This technology typically involves placing a mandrel with a specific profile inside the electrode blank, and using radial pressure to plastically deform the blank and conform it to the shape of the mold, thereby forming a pre-designed hollow cavity.

[0004] However, while this process allows for precise structural control, it presents significant technical limitations when applied to long electrodes. After molding, the mold needs to be removed from the electrode cavity. Due to the large contact area between the electrode material and the mold surface, as well as the residual stress generated by plastic deformation, the demolding process requires an extremely large axial force. As the electrode length increases, the demolding resistance rises significantly, and the tensile stress and surface friction load on the mold during demolding increase dramatically. This easily leads to stress concentration in weak areas of the mold structure (such as the root of slender sections or abrupt changes in cross-section), resulting in permanent deformation, surface scratches, or brittle fracture of the mold. Abnormal mold damage not only increases production costs but also seriously affects production continuity and product consistency, becoming a bottleneck restricting the large-scale application of hollow long electrodes. Therefore, improvements are needed. Utility Model Content

[0005] To reduce the possibility of mold breakage and damage during demolding, this application provides a mold that facilitates demolding.

[0006] The mold for easy demolding provided in this application adopts the following technical solution: A mold for easy demolding includes a mold shank, a punch insert disposed on the mold shank, and a front ejector block slidably disposed in the punch insert. The mold shank is provided with a control element for driving the front ejector block to slide. The sliding path of the front ejector block and the moving path of the mold shank are on the same straight line.

[0007] By adopting the above technical solution, during electrode demolding, the front ejector block extends from the punch insert via a control component. This pushes the electrode away from the punch insert, causing relative movement between the electrode and the punch insert, thus completing demolding. The front ejector block applies an axial ejection force to the electrode from within the hollow electrode, ensuring the demolding force is evenly distributed within the electrode. This reduces the possibility of excessive local stress at the connection between the punch insert and the die shank, and demolding is not solely achieved by pulling the punch insert out of the electrode, thus reducing the likelihood of mold breakage due to excessive tensile force. The coaxial arrangement ensures consistent force transmission direction, reducing stress concentration caused by path deviations. This fundamentally reduces the risk of mold breakage or plastic deformation, improving mold lifespan and production reliability.

[0008] Optionally, a front ejector pin is slidably disposed at one end of the die shank near the punch insert. The control component can drive the front ejector pin to slide. The sliding direction of the front ejector pin is the same as the sliding direction of the front ejector block. The front ejector pin abuts against the outer wall of the electrode to be processed.

[0009] By adopting the above technical solution, the front ejector pin is driven by the control component and abuts against the outer wall of the electrode, providing external ejection force during demolding. The internal ejection of the front ejector pin and the front ejector block are combined to form a coordinated internal and external ejection mechanism, further dispersing the demolding resistance. The sliding direction of the front ejector pin is consistent with that of the front ejector block, ensuring the synchronization and directional consistency of the ejection force, reducing the possibility of electrode misalignment or jamming during demolding. This dual ejection design is particularly suitable for hollow electrodes with a large length-to-diameter ratio, effectively reducing local stress peaks at the contact surface between the mold and the electrode, further reducing the probability of surface scratches or brittle fracture of the mold.

[0010] Optionally, the front ejector pins are symmetrically arranged on both sides of the punch insert.

[0011] By adopting the above technical solution, the symmetrically arranged front ejector pins can apply a balanced ejection force to the electrode, reducing the possibility of the electrode tilting or twisting due to uneven force during demolding. This balanced ejection not only improves the stability of demolding but also reduces the possibility of local overload of the mold, making it particularly suitable for electrode products with asymmetrical cross-sections or uneven wall thicknesses, further reducing the risk of mold breakage due to eccentric loads.

[0012] Optionally, the punch insert has a demolding slope on the side near the electrode to be processed.

[0013] By adopting the above technical solution, when the die shank is forming the electrode, a slope will be formed on the inner wall of the electrode, so that the contact surface between the punch insert and the inner wall of the electrode is a slope. Thus, at the moment of mold opening, the demolding slope on the punch insert will first form a small gap with the inner wall of the electrode. This gap will rapidly increase as the mold opening stroke increases, so that the electrode can easily separate from the punch insert, greatly reducing the contact area and friction.

[0014] Optionally, the control component includes a float block slidably disposed in the mold shank and a control source disposed on the float block. The front ejector block and the front ejector pin are both disposed on the float block, and the length of the front ejector block along the moving direction of the mold shank is greater than the length of the front ejector pin.

[0015] By adopting the above technical solution, when the control source controls the movement of the floating block, the floating block can simultaneously drive the front ejector block and the front ejector pin, ensuring that the two move synchronously during the demolding process and reducing the possibility of stress concentration due to timing differences. The length of the front ejector block along the mold shank movement direction is greater than that of the front ejector pin, so that the front ejector block contacts the inside of the electrode first in the initial stage of demolding, providing a longer ejection stroke and a greater ejection force, thereby more effectively breaking the adhesion between the inner wall of the electrode and the punch insert, further reducing demolding resistance and improving the demolding success rate.

[0016] Optionally, the mold handle is provided with an inner pad tube for sliding the floating material block, and the mold handle is also provided with an inner pad block. The inner pad block has several sliding holes. The front ejector block and the front ejector pin are both slidably disposed in the sliding holes. The surface of the inner pad tube near the floating material block and the surface of the sliding hole are smooth.

[0017] By adopting the above technical solution, the inner pad provides precise sliding guidance for the floating block, while the sliding holes on the inner pad guide the axial movement of the front ejector block and the front ejector pin. The smooth surface design greatly reduces the coefficient of sliding friction. This not only ensures the smoothness and repeatability of the ejection action but also reduces wear and extends mold life. The excellent guiding properties also reduce the possibility of the front ejector block and the front ejector pin wobbling under high pressure, further reducing the probability of mold damage due to non-axial forces.

[0018] Optionally, the end of the die shank away from the punch insert is provided with a connecting screw hole, and a back stop is threaded into the connecting screw hole. The back stop is provided with a mounting hole for installing an inner pad tube. The inner pad is located on the side of the inner pad tube near the punch insert. An annular groove is provided on the circumferential outer wall of the inner pad tube near the back stop, and the back stop is located in the annular groove.

[0019] By adopting the above technical solution, when installing the mold, the inner pad block can be placed into the mold shank first, then the inner pad tube can be placed into the mold shank, so that the inner pad tube is located on the side of the inner pad block away from the punch insert. Next, the floating material block is inserted into the inner pad tube, so that the front ejector block and the front ejector pin are inserted into the sliding hole. Finally, the rear stop block is threaded into the connecting screw hole, ensuring that the rear stop block is located in the annular groove. This method is convenient and the installation steps are simple. Furthermore, the rear stop block is threaded onto the mold shank, facilitating quick disassembly and assembly, and simplifying the maintenance or replacement of internal components. The cooperation between the annular groove and the rear stop block achieves axial positioning of the inner pad tube and inner pad block. After the rear stop block is fixed, its side wall abuts against the groove wall of the annular groove, thus preventing the inner pad tube from loosening or shifting during operation. This enhances the rigidity and stability of the overall structure, maintaining alignment of components during high-pressure demolding and reducing fatigue damage caused by structural loosening. Furthermore, the inner pad tube and inner pad block are usually made of pre-hardened steel to maintain a smooth surface. Pre-hardened steel is expensive, and threading the inner pad tube made of pre-hardened steel will inevitably produce pre-hardened steel scrap, resulting in waste of pre-hardened steel. Therefore, the setting of the back stop block reduces the material used for the inner pad tube and saves the production cost of the mold.

[0020] Optionally, the rear stop includes a connecting part connected to the connecting screw hole and an anti-detachment part disposed on the side of the connecting part away from the punch insert, wherein the diameter of the anti-detachment part is larger than the diameter of the connecting part.

[0021] By adopting the above technical solution, the diameter of the anti-detachment part is larger than that of the connecting part. This increases the contact area between the rear stop and the mold shank, resulting in increased friction between the rear stop and the mold shank after tightening. This improves the connection stability between the rear stop and the mold shank, enhancing the limiting effect of the rear stop on the inner gasket tube. It effectively prevents the rear stop from accidentally loosening under vibration or high pressure, improving the safety and reliability of the equipment. It is particularly suitable for industrial environments with long-term high-frequency operation, reducing the risk of mold failure or production interruption due to fastener failure.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. During demolding, the front ejector block in the punch insert pushes the interior of the hollow electrode, while the front ejector pin pushes the outer walls of the electrode on both sides, thus dispersing the demolding force and reducing the possibility of local stress concentration and breakage of the punch insert. 2. The front ejector block and front ejector pin move synchronously with the floating material block, ensuring the ejection effect of the electrode; 3. The rear stop block simplifies the mold installation process and ensures high overall structural strength, making the mold less prone to loosening or damage after long-term use and extending its service life. Attached Figure Description

[0023] Figure 1This is a schematic diagram of the overall structure of an embodiment of this application.

[0024] Figure 2 This is a cross-sectional structural diagram of an embodiment of this application.

[0025] Explanation of reference numerals in the attached figures: 1. Mold handle; 11. Front ejector pin; 12. Inner pad tube; 121. Annular groove; 13. Inner pad block; 131. Sliding hole; 14. Connecting screw hole; 15. Rear stop block; 151. Mounting hole; 152. Connecting part; 153. Anti-detachment part; 2. Punch insert; 21. Drafting slope; 3. Front ejector block; 4. Control component; 41. Floating material block; 42. Control source. Detailed Implementation

[0026] The following is in conjunction with the appendix Figure 1-2 This application will be described in further detail.

[0027] This application discloses a mold that facilitates demolding.

[0028] Reference Figure 1 and Figure 2 A mold for easy demolding includes a mold shank 1, a punch insert 2, a front ejector block 3, and a control component 4, wherein the mold shank 1 is movable toward or away from the electrode to be processed.

[0029] Reference Figure 1 and Figure 2 The front ejector block 3 is slidably disposed in the punch insert 2, and the control component 4 is disposed in the die shank 1. It is used to drive the front ejector block 3 to slide towards or away from the electrode. The sliding path of the front ejector block 3 and the moving path of the die shank 1 are on the same straight line.

[0030] Reference Figure 1 The mold handle 1 is the basic support component of the entire mold. It is usually made of high-strength metal materials, such as alloy steel. This material has good strength and toughness and can withstand various forces during the processing.

[0031] Reference Figure 2 The punch insert 2 has a channel inside for the front push block 3 to slide. The inner wall of the channel is smooth to ensure that the front push block 3 can slide smoothly. The front push block 3 can be made of stainless steel and is cylindrical in shape. The front end is designed to conform to the shape of the inner cavity of the electrode so as to better contact the electrode.

[0032] Reference Figure 2 A front ejector pin 11 is slidably provided at one end of the mold handle 1 near the punch insert 2. The control component 4 can drive the front ejector pin 11 to slide. The sliding direction of the front ejector pin 11 is the same as the sliding direction of the front ejector block 3, and the front ejector pin 11 abuts against the outer wall of the electrode to be processed.

[0033] Reference Figure 2 The front ejector pin 11 can be made of high-speed steel, which allows for good contact with the outer wall of the electrode. One front ejector pin 11 is located on each side of the punch insert 2, so that during demolding, the front ejector pins 11 on both sides can simultaneously apply force to the outer wall of the electrode, resulting in a smoother demolding process. The punch insert 2 has a demolding ramp 21 on the side closest to the electrode to be processed, which facilitates the separation of the electrode from the punch insert 2 during demolding.

[0034] Reference Figure 2 The control component 4 includes a float block 41 and a control source 42. The float block 41 is slidably disposed in the mold shank 1. The control source 42 can be a cylinder or an electromagnet. The front ejector block 3 and the front ejector pin 11 are both fixed on the float block 41. The length of the front ejector block 3 along the moving direction of the mold shank 1 is greater than the length of the front ejector pin 11. In this way, during demolding, the front ejector block 3 can contact the electrode first, thus playing a better role in demolding assistance.

[0035] Reference Figure 2 The mold handle 1 is provided with an inner pad tube 12 for sliding the floating material block 41. The mold handle 1 is also provided with an inner pad block 13, which has a plurality of sliding holes 131. In this embodiment, the number of sliding holes 131 is preferably three. The front ejector block 3 and the front ejector pin 11 are both slidably disposed in the sliding holes 131. The tube wall of the inner pad tube 12 near the floating material block 41 and the hole wall of the sliding holes 131 are smooth.

[0036] Reference Figure 2 The inner pad tube 12 and the inner pad block 13 can be made of pre-hardened steel material, which has good wear resistance and self-lubricating properties, can reduce the frictional resistance when the floating block 41 slides, and ensure that the front top block 3 and the front top pin 11 can slide smoothly.

[0037] Reference Figure 2 The end of the mold handle 1 away from the punch insert 2 is provided with a connecting screw hole 14. A rear stop 15 is threaded into the connecting screw hole 14. The rear stop 15 is provided with a mounting hole 151 for installing the inner pad tube 12. The inner pad 13 is located on the side of the inner pad tube 12 near the punch insert 2. An annular groove 121 is provided on the circumferential outer wall of the inner pad tube 12 near the rear stop 15. The rear stop 15 is located in the annular groove 121.

[0038] Reference Figure 2 The rear stop 15 includes a connecting part 152 that is threadedly connected to the connecting screw hole 14, and an anti-detachment part 153 disposed on the side of the connecting part 152 away from the punch insert 2. The diameter of the anti-detachment part 153 is larger than the diameter of the connecting part 152, which can enhance the connection strength between the rear stop 15 and the die shank 1.

[0039] The implementation principle of a mold for easy demolding according to an embodiment of this application is as follows: the mold drives the front ejector block 3 and the front ejector pin 11 to slide through the control component 4. The front ejector pin 11 abuts against the outer wall of the electrode, and the front ejector block 3 acts on the inner cavity of the electrode, simultaneously assisting the punch insert 2 to disengage from the inner cavity of the electrode from both the inner and outer sides. This design reduces the resistance during demolding, reduces the tensile stress and surface friction load borne by the punch insert 2, and reduces the possibility of stress concentration in the weak areas of the mold structure, thereby protecting the mold from damage, extending the service life of the mold, improving the continuity of production and the consistency of products, and improving the production quality and efficiency of hollow electrodes.

[0040] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A mold that facilitates demolding, characterized in that: It includes a mold shank (1), a punch insert (2) disposed on the mold shank (1), and a front ejector block (3) slidably disposed in the punch insert (2). The mold shank (1) is provided with a control element (4), which is used to drive the front ejector block (3) to slide. The sliding path of the front ejector block (3) is on the same straight line as the moving path of the mold shank (1).

2. The mold for easy demolding according to claim 1, characterized in that: A front ejector pin (11) is slidably disposed at one end of the die shank (1) near the punch insert (2). The control component (4) can drive the front ejector pin (11) to slide. The sliding direction of the front ejector pin (11) is the same as the sliding direction of the front ejector block (3). The front ejector pin (11) abuts against the outer wall of the electrode to be processed.

3. The mold for easy demolding according to claim 2, characterized in that: The front ejector pin (11) is symmetrically arranged on both sides of the punch insert (2).

4. The mold for easy demolding according to claim 2, characterized in that: The punch insert (2) has a demolding slope (21) on the side near the electrode to be processed.

5. A mold for easy demolding according to claim 2, characterized in that: The control component (4) includes a floating block (41) slidably disposed in the mold shank (1) and a control source (42) disposed on the floating block (41). The front ejector block (3) and the front ejector pin (11) are both disposed on the floating block (41). The length of the front ejector block (3) along the moving direction of the mold shank (1) is greater than the length of the front ejector pin (11).

6. The mold for easy demolding according to claim 5, characterized in that: The mold handle (1) is provided with an inner pad tube (12) for sliding the floating material block (41). The mold handle (1) is also provided with an inner pad block (13). The inner pad block (13) has several sliding holes (131). The front top block (3) and the front ejector pin (11) are both slidably disposed in the sliding holes (131). The inner pad tube (12) is smooth near the tube wall of the floating material block (41) and the hole wall of the sliding hole (131).

7. A mold for easy demolding according to claim 6, characterized in that: The end of the die handle (1) away from the punch insert (2) is provided with a connecting screw hole (14), and a back stop (15) is threaded into the connecting screw hole (14). The back stop (15) is provided with a mounting hole (151) for installing the inner pad tube (12). The inner pad (13) is located on the side of the inner pad tube (12) close to the punch insert (2). The inner pad tube (12) is provided with an annular groove (121) on the circumferential outer wall close to the back stop (15), and the back stop (15) is located in the annular groove (121).

8. A mold for easy demolding according to claim 7, characterized in that: The rear stop (15) includes a connecting part (152) connected to the connecting screw hole (14) and an anti-detachment part (153) disposed on the side of the connecting part (152) away from the punch insert (2), wherein the diameter of the anti-detachment part (153) is larger than the diameter of the connecting part (152).

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