Drawing mold and equipment for drawing and forming shell

Abstract

The drawing mold comprises an outer mold body with a concave cavity and an inner mold body arranged in the concave cavity, the inner mold body comprises a base, a plurality of mold cores and a driving block capable of driving the mold cores to slide relative to the base, a plurality of sliding grooves are formed in the base, the mold cores are provided with sliding blocks stretching into the sliding grooves, reset elastic pieces are arranged in the sliding grooves, and the reset elastic pieces are arranged on the sliding blocks. When the driving block longitudinally moves relative to the base, the plurality of mold cores can be driven to transversely move relative to the base, so that the plurality of mold cores are changed from a closed state to an open state, and a gap required for drawing a shell is formed between the outer edges of the plurality of mold cores and the inner wall of the concave cavity of the outer mold; the outer size of the shell is smaller than or equal to the inner size of the cavity, and the inner size of the shell is larger than the size of the outer edges of the mold cores in the closed state. Compared with the prior art, the method has the advantages that the action of reducing the diameter of the shell is omitted, the wall is directly reduced, the poor appearance such as fine drawing lines and orange peel caused by diameter reduction is avoided, and the rate of finished products is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of battery casing processing equipment technology, specifically to a drawing mold and equipment for casing drawing and molding. Background Technology

[0002] Existing battery casing processing equipment uses a drawing mold consisting of an inner mold and an outer mold. The outer mold has a drawing cavity extending along the drawing direction. The inner mold can be inserted into the drawing cavity. A drawing gap corresponding to the casing is formed between the outer edge of the inner mold and the inner wall of the drawing cavity. However, the outer dimension of the casing before drawing is larger than the inner wall dimension of the drawing cavity, the inner cavity dimension of the casing before drawing is larger than the outer edge dimension of the inner mold, and the wall thickness of the casing before drawing is larger than the drawing gap between the outer edge of the inner mold and the inner wall of the drawing cavity. As a result, during casing drawing, the drawing mold must simultaneously reduce the diameter (both the inner and outer dimensions of the casing are reduced) and reduce the wall thickness (the material of the outer and inner walls of the casing is reduced, increasing the inner dimension and decreasing the outer dimension) to obtain the required outer dimension, inner dimension, and wall thickness of the casing. This easily leads to defects such as fine drawing marks and orange peel appearance after the casing is drawn, resulting in a low yield. Summary of the Invention

[0003] The purpose of this invention is to provide a drawing mold and equipment that avoids appearance defects such as fine drawing lines and orange peel caused by diameter reduction and effectively improves the yield of the drawing process, thereby solving the above-mentioned technical problems.

[0004] This invention provides a drawing mold for shell drawing, comprising an outer mold and an inner mold. The outer mold has a cavity for accommodating the inner mold, and the inner mold is disposed within the cavity. A gap is provided between the inner mold and the outer mold to allow the shell to pass through. The inner mold includes a base, a plurality of mold cores, and a driving block capable of driving the plurality of mold cores to slide relative to the base. When the driving block extends out of the plurality of mold cores, the plurality of mold cores are in a closed state; when the driving block is flush with the plurality of mold cores, the plurality of mold cores are in an open state. The base is provided with a plurality of The mold core has a sliding block that extends into the sliding groove. The sliding groove is equipped with a reset elastic element. One end of the elastic element presses against the base, and the other end presses against the sliding block. When the driving block moves longitudinally relative to the base, it can drive several mold cores to move laterally relative to the base, so that several mold cores change from a closed state to an open state. This creates a gap between the outer edge of several mold cores and the inner wall of the cavity of the outer mold, which is required to form a shell. The outer dimension of the shell is less than or equal to the inner dimension of the cavity, and the inner dimension of the shell is greater than the outer dimension of the several mold cores when they are in the closed state.

[0005] Preferably, the drive block is provided with a first inclined surface and a first positioning surface, and the mold core is provided with a second inclined surface that contacts the first inclined surface and a second positioning surface that contacts the first positioning surface.

[0006] Preferably, the drawing mold further includes a hydraulic cylinder, the cylinder column of which is fixedly connected to the drive block.

[0007] Preferably, the cavity size of the outer mold gradually decreases from bottom to top.

[0008] Preferably, the base is further provided with a limiting groove, and the mold core is provided with a limiting block extending into the limiting groove.

[0009] Preferably, the cross-section of the limiting groove and the cross-section of the limiting block are both dovetail-shaped.

[0010] Preferably, the limiting groove is located above the slide groove, and the limiting groove and the slide groove are interconnected; the limiting block is located above the slider, and the limiting block and the slider are interconnected.

[0011] Preferably, the number of mold cores is four, and each mold core has connecting blocks at both ends to allow adjacent mold cores to be connected to each other in an alternating manner.

[0012] The present invention also provides a device for drawing and molding a housing, the device having the aforementioned drawing mold, the device further including a base, a support frame with a cavity, a support column and a support plate, the outer mold being disposed on the support plate, the inner mold being disposed on the support column, the support frame being fixed on the base, and the support column being fixed on the support frame and located in the cavity.

[0013] Preferably, the hydraulic cylinder is fixed on the base, and the cylinder column passes through the support column and the inner mold and is connected to the drive block.

[0014] Compared with the prior art, the outer dimensions of the shell before extraction in this invention are less than or equal to the inner dimensions of the cavity of the outer mold, and greater than the outer dimensions of the outer edges of several mold cores when in a closed state. During extraction, the shell is first placed between the inner mold and the outer mold. Then, the driving block moves longitudinally relative to the base, driving several mold cores to move laterally relative to the base, so that the outer edges of the mold cores push the shell outward until the outer wall, forming the required gap between the outer edges of the mold cores and the inner wall of the cavity of the outer mold. The mold cores then stop moving. Then, the shell is pulled out by the clamps, so that the shell passes through the gap formed between the outer edges of the mold cores and the inner wall of the cavity of the outer mold. After the shell is pulled out, the required outer and inner dimensions of the shell are obtained. Thus, this invention has the following beneficial effects: 1. The mold cores are pulled out more quickly during extraction. The outer edge of the core will support the shell to obtain the required outer shell size, while the inner wall material of the shell will be reduced to obtain the required inner shell size and shell wall thickness. When the outer shell size is equal to the inner cavity size, only the inner wall material of the shell needs to be reduced to obtain the required inner shell size and shell wall thickness, avoiding appearance defects such as fine drawing marks and orange peel caused by diameter reduction, effectively improving the yield. 2. When the inner shell size is larger than the outer edge size of several core blocks in the closed state, the gap between the inner mold and the inner wall of the cavity is larger when several core blocks are in the closed state. Automated equipment such as a robot can be used to place the shell into the gap between the inner mold and the outer mold of the drawing mold, improving the stability of producing large-diameter aluminum shells, saving manual material feeding, and realizing fully automated production. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a drawing mold for shell drawing according to the present invention;

[0016] Figure 2 for Figure 1 A schematic diagram of the structure after the shell is placed between the inner mold and the outer mold;

[0017] Figure 3 This is a schematic diagram of the assembly structure of the inner mold and the outer mold when the mold core is in the closed state;

[0018] Figure 4 This is a schematic diagram of the assembly structure of the inner mold and the outer mold when the mold core is in the open state;

[0019] Figure 5 for Figure 3 A sectional view;

[0020] Figure 6 for Figure 4 A sectional view;

[0021] Figure 7 This is an exploded view of the inner mold;

[0022] Figure 8 A 3D diagram of one of the core modules;

[0023] Figure 9This is a schematic diagram of the structure of a device for drawing and molding a housing according to the present invention;

[0024] Figure 10 This is a schematic diagram of the structure of a device for drawing and molding a housing according to the present invention;

[0025] Figure 11 This is a comparison image of the appearance of the shell after extraction according to the present invention and the appearance of the shell after extraction according to the prior art;

[0026] The implementation and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0027] The following drawings disclose several embodiments of the present invention. For clarity, many practical details will be described in the following description. However, it should be understood that these practical details are not intended to limit the invention. That is, in some embodiments of the invention, these practical details are not essential. Furthermore, for the sake of simplicity, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0028] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0029] Furthermore, in this invention, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the invention. They are merely used to distinguish components or operations described using the same technical terms, and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If a combination of technical solutions is contradictory or impossible to implement, such a combination should be considered nonexistent and not within the scope of protection claimed by this invention.

[0030] To further understand the content, features, and effects of this invention, the following embodiments are provided, and detailed descriptions are given below in conjunction with the accompanying drawings:

[0031] like Figures 1 to 8 , Figure 11As shown, a drawing mold for shell forming according to the present invention includes an outer mold 1 and an inner mold 2. The outer mold 1 has a cavity 11 for accommodating the inner mold, and the inner mold 2 is disposed in the cavity 11. A gap is provided between the inner mold 2 and the outer mold 1 to allow the shell to pass through. The inner mold 2 includes a base 21, four mold cores 22, and a driving block 23 that can drive the four mold cores 22 to slide relative to the base 21. When the driving block 23 extends out of the four mold cores 22, the four mold cores 22 are in a closed state (e.g., Figure 3 , Figure 5 (As shown); when the drive block 23 is flush with the four mold cores 22, the four mold cores 22 are in the open state (as shown). Figure 4 , Figure 6 (As shown); The base 21 is provided with four sliding grooves 211, and the mold core 22 is provided with a slider 221 extending into the sliding groove 211. The sliding groove 211 is provided with a reset elastic element 24. One end of the elastic element 24 presses against the base 21, and the other end presses against the slider 221. When the driving block 23 moves longitudinally relative to the base 21, it can drive the four mold cores 22 to move laterally relative to the base 21, so that the four mold cores change from a closed state to an open state, so that the gap required for drawing the shell 3 is formed between the outer edge of the four mold cores and the inner wall of the cavity of the outer mold. The outer dimension of the shell 3 is less than or equal to the inner dimension of the cavity 11, and the inner dimension of the shell 3 is greater than the dimension of the outer edge of the four mold cores 22 when they are in the closed state.

[0032] Specifically, the drive block 23 is provided with a first inclined surface 231 and a first positioning surface 232, and the mold core 22 is provided with a second inclined surface 222 that contacts the first inclined surface 231 and a second positioning surface 223 that contacts the first positioning surface 232. The drawing mold also includes a hydraulic cylinder 4, and the cylinder column 41 of the hydraulic cylinder 4 is fixedly connected to the drive block 23.

[0033] Furthermore, the size of the cavity 11 of the outer mold 1 gradually decreases from bottom to top and transitions to the same size end, ensuring that the chuck pulls the housing 3 smoothly and stably. The same size end ensures that the housing 3 and the end are in surface-to-surface contact, ensuring that the outer size of the housing 3 meets the requirements.

[0034] More specifically, the base 21 is also provided with a limiting groove 212, and the mold core 22 is provided with a limiting block 224 extending into the limiting groove 212. The cross-section of the limiting groove 212 and the cross-section of the limiting block 224 are both dovetail-shaped. The dovetail-shaped limiting groove 212 and limiting block 224 can limit the mold core 22 to move only laterally on the base 21, and not longitudinally. The limiting groove 212 is located above the slide 211, and the limiting groove 212 and the slide 211 are interconnected; the limiting block 224 is located above the slider 221, and the limiting block 224 and the slider 221 are interconnected. This arrangement makes the inner mold 2 structure compact, with fewer parts, and simple to install. The end of the limiting groove 212 is provided with a detachable baffle 213, which is fixed to the base 21 by screws, and one end of the elastic element 24 is pressed against the baffle 213.

[0035] Each of the four mold cores 22 has a connecting block 225 at both ends, which allows adjacent mold cores 22 to be interleaved. During the process of the four mold cores 22 being in a closed state, or changing from a closed state to an open state, or after they have become open, the connecting blocks 225 between adjacent mold cores 22 are always interleaved, ensuring the stability of the four mold cores 22 when they move relative to each other.

[0036] The working principle of the extraction mold of this invention is as follows: The shell 3 before extraction is placed into the gap between the inner mold 2 and the outer mold 1, leaving only a part of the shell 3 exposed on the upper side of the extraction mold. Then, the hydraulic cylinder 4 is activated, causing the cylinder column 41 to move towards the base 5 (i.e., longitudinally). The movement of the cylinder column 5 drives the driving block 23 to move longitudinally relative to the base 21. When the driving block 23 moves longitudinally, it presses the second inclined surface 222 of the four mold cores 22 through the first inclined surface 231, causing the four mold cores 22 to overcome the elastic force of the elastic element and move laterally relative to the base 21 until the driving block 23... The first positioning surface 232 and the second positioning surface 223 of the four mold cores 22 are completely overlapped. At this time, the four mold cores 22 are in an open state. At the same time, the outer edges of the four mold cores 22 push the shell 3 outward so that the gap required for drawing the shell is formed between the outer edge of the mold core 22 and the inner wall of the cavity 11 of the outer mold 1. At this time, the part of the shell 3 exposed on the upper side of the drawing mold is clamped by the clamp, so that the shell 3 passes through the gap formed between the outer edge of the mold core 22 and the inner wall of the cavity 11 of the outer mold 1 and obtains the required outer and inner dimensions of the shell 3 after being drawn. Compared with the prior art, the present invention has the following beneficial effects: 1. When the outer dimension of the drawn shell 3 is smaller than the inner dimension of the cavity 11, the outer edge of the mold core 22 will support the shell 3 during drawing to obtain the required outer dimension of the shell 3, while reducing the inner wall material of the shell 3 to obtain the required inner dimension and wall thickness of the shell 3; when the outer dimension of the drawn shell 3 is equal to the inner dimension of the cavity 11, only the inner wall material of the shell 3 needs to be reduced to obtain the required inner dimension and wall thickness of the shell 3, avoiding the appearance defects such as fine drawing marks and orange peel caused by diameter reduction, effectively improving the yield; 2. The inner dimension of the shell 3 is larger than the outer dimension of the four mold cores 22 when they are in the closed state. When the four mold cores 22 are in the closed state, the gap between the inner mold 2 and the inner wall of the cavity 11 is larger. Automated equipment such as a robot can be used to place the shell 3 into the gap between the inner mold 2 and the outer mold 1 of the drawing mold, improving the stability of producing large-diameter aluminum shells, saving manual material feeding, and realizing fully automated production.

[0037] like Figure 9 , Figure 10As shown, the present invention also provides a device for drawing and molding a housing. This device includes the aforementioned drawing mold, a base 5, a support frame 6 with a cavity 61, a support column 7, and a support plate 8. The outer mold 1 is mounted on the support plate 8, and the inner mold 2 is mounted on the support column 7. The support frame 6 is fixed to the base 5, and the support column 7 is fixed to the support frame 6 and located within the cavity 61. A hydraulic cylinder 4 is fixed to the base 5, and the cylinder column 41 passes through the support column 7 and the inner mold 2 before being connected to a drive block 23. In use, the housing 3 before drawing is first placed into the gap between the inner mold 2 and the outer mold 1, and the housing 3 is pushed into the cavity 61 of the support frame 6, leaving only a portion of the housing 3 exposed above the drawing mold. The drawing process of the housing 3 follows the same principle as the aforementioned drawing mold, obtaining the required outer dimensions, inner dimensions, and wall thickness of the housing 3.

[0038] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A drawing die for forming a shell, comprising an outer die and an inner die, the outer die having a cavity for accommodating the inner die, the inner die being disposed within the cavity, and a gap between the inner die and the outer die allowing the shell to pass through, characterized in that: The inner mold includes a base, several mold cores, and a driving block that can drive the mold cores to slide relative to the base. When the driving block extends out of the mold cores, the mold cores are in a closed state; when the driving block is flush with the mold cores, the mold cores are in an open state. The base is provided with several sliding grooves, and the mold cores are provided with sliders that extend into the sliding grooves. The sliding grooves are provided with reset elastic elements, one end of which presses against the base and the other end of which presses against the slider. When the driving block moves longitudinally relative to the base, it can drive the mold cores to move laterally relative to the base, causing the mold cores to change from a closed state to an open state. This creates a gap between the outer edge of the mold cores and the inner wall of the cavity of the outer mold required for drawing the shell. The outer dimension of the shell is less than or equal to the inner dimension of the cavity, and the inner dimension of the shell is greater than the outer dimension of the mold cores when they are in a closed state.

2. A drawing die for shell drawing according to claim 1, characterized in that: The drive block is provided with a first inclined surface and a first positioning surface, and the mold core is provided with a second inclined surface that contacts the first inclined surface and a second positioning surface that contacts the first positioning surface.

3. A drawing die for shell drawing according to claim 1, characterized in that: The drawing mold also includes a hydraulic cylinder, with the cylinder column fixedly connected to the drive block.

4. A drawing die for shell drawing according to claim 1, characterized in that: The cavity size of the outer mold gradually decreases from bottom to top.

5. A drawing die for shell drawing according to claim 1, characterized in that: The base is also provided with several limiting grooves, and the mold core is provided with a limiting block that extends into the limiting groove; the end of the limiting groove is provided with a detachable baffle, and one end of the elastic element is pressed against the baffle.

6. A drawing die for shell drawing according to claim 5, characterized in that: The cross-section of the limiting groove and the cross-section of the limiting block are both dovetail-shaped.

7. A drawing die for shell drawing according to claim 6, characterized in that: The limiting groove is located above the slide groove, and the limiting groove and the slide groove are interconnected; the limiting block is located above the slider, and the limiting block and the slider are interconnected.

8. A drawing die for shell drawing according to claim 1, characterized in that: The number of mold cores is four, and each mold core has connecting blocks at both ends to allow adjacent mold cores to be connected to each other in an alternating manner. Correspondingly, the number of sliding grooves and limiting grooves is four.

9. An apparatus for shell drawing, characterized in that: the apparatus is provided with a drawing mold as described in any one of claims 1 to 8, the apparatus further includes a base, a support frame with a cavity, a support column and a support plate, the outer mold is disposed on the support plate, the inner mold is disposed on the support column, the support frame is fixed on the base, and the support column is fixed on the support frame and located in the cavity.

10. The apparatus for drawing and molding a housing according to claim 9, characterized in that: The hydraulic cylinder is fixed on the base, and the cylinder column passes through the support column and the inner mold before being connected to the drive block.

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