Sheet metal forming die and sheet metal forming method

Abstract

The present invention discloses a sheet metal forming die and a sheet metal forming method using the sheet metal forming die. The sheet metal forming die includes a lower die and an upper die. The automatic clamping of the sheet metal into the second profiling surface is achieved by using a guiding surface, eliminating manual operation, optimizing the process time, greatly improving the production efficiency, preventing the problem of die pressing on the periphery of the sheet metal during mold closing, ensuring product quality and avoiding damage to the die. In addition, the cooperation between the first profiling surface and the second profiling surface can prevent the appearance of parting lines on the side frame of the mobile phone case after the product is formed, solving the problem of parting lines that often occur in the industry after the side frame is formed and greatly improving the product quality.

Description

Technical Field

[0001] The present invention relates to the technical field of molds, and particularly relates to a sheet metal forming mold and a sheet metal forming method. Background Art

[0002] Sheet metal forming often uses hot forming or injection molding processes. When the periphery of the sheet metal needs to be formed into a bent and flanged shape, for similar products such as the side frame of a mobile phone case, the related forming mold is provided with a forming groove. During production, workers need to manually embed the perimeter of the sheet metal into the forming groove and then close the mold. The perimeter forms the side frame of the mobile phone case in the forming groove. Such a production method is time-consuming and laborious; if the perimeter of the sheet metal does not enter the forming groove during mold closing, the mold will press on the edge of the sheet metal, damaging the product and the mold. Summary of the Invention

[0003] The present invention aims to at least solve one of the above technical problems in the related art to some extent. For this purpose, the present invention provides a sheet metal forming mold that can improve production efficiency and product quality.

[0004] To achieve the above object, the technical solution of the present invention is as follows:

[0005] The present invention also provides a sheet metal forming method using the above sheet metal forming mold.

[0006] The sheet metal forming mold according to the first aspect embodiment of the present invention includes: a lower mold provided with a first mold cavity, the periphery of the first mold cavity bulges upward, and the inner wall of the periphery forms a first profiling surface, and a card slot is provided outside the first mold cavity; an upper mold including a pressure head and a second mold cavity, the pressure head is located in the second mold cavity and can move independently in the direction of the first mold cavity; a second profiling surface is formed between the outer wall of the pressure head and the second mold cavity, and an arc-shaped guiding surface extends downward along the second profiling surface, and the tangent line at the connection of the guiding surface and the second profiling surface faces the pressure head; wherein, after mold closing, the guiding surface is closely attached to the card slot, and a sealed forming cavity is formed between the first mold cavity, the second profiling surface and the outer wall of the pressure head.

[0007] The sheet metal forming mold according to the embodiment of the present invention has at least the following beneficial effects: The guiding surface is used to automatically clamp the sheet metal into the second profiling surface, eliminating manual operation, optimizing the process time, greatly improving the production efficiency, and preventing the problem of mold pressing on the sheet metal perimeter during mold closing, ensuring product quality and avoiding damage to the mold; in addition, the cooperation of the first profiling surface and the second profiling surface can prevent the appearance of parting lines on the side frame of the mobile phone case after product forming, solving the problem of parting lines that often occur in the industry after side frame forming, and greatly improving the product quality.

[0008] According to some embodiments of the present invention, at a position corresponding to the camera hole of the mobile phone case, the first mold cavity is provided with a limiting post, and the bottom surface of the pressing head is provided with a jack cooperating with the limiting post.

[0009] According to some embodiments of the present invention, when the molds are closed, the first profiling surface and the second profiling surface are connected with equal radian, and the peripheral side walls of the pressing head are arc-shaped.

[0010] According to some embodiments of the present invention, the sheet metal forming mold is a hot pressing mold, and further includes a heating device.

[0011] According to some embodiments of the present invention, the sheet metal forming mold is an injection mold, and the lower mold is provided with a glue injection port communicating with the forming cavity.

[0012] The sheet metal forming method according to the second aspect embodiments of the present invention includes the following steps:

[0013] S1: Place the sheet on top of the first mold cavity;

[0014] S2: The upper mold moves downward close to the lower mold, and the pressing head moves towards the first mold cavity, pressing the sheet into the first mold cavity, so that the periphery of the sheet warps upward;

[0015] S3: The pressing head remains stationary, the upper mold moves downward, and the warped periphery of the sheet abuts against the guiding surface;

[0016] S4: As the upper mold continues to move downward, the periphery of the sheet bends along the guiding surface towards the second profiling surface and inserts into the second profiling surface;

[0017] S5: The upper mold and the lower mold complete mold closing, and the sheet is subjected to a forming process in the forming cavity.

[0018] The sheet metal forming method according to the embodiments of the present invention has at least the following beneficial effects: saving labor costs and greatly optimizing the forming process time of the sheet 500.

[0019] According to some embodiments of the present invention, when the sheet metal forming mold is a hot pressing mold, in step S5, the sheet is subjected to a hot pressing forming treatment in the forming cavity.

[0020] According to some embodiments of the present invention, when the sheet metal forming mold is an injection mold, in step S5, in the forming cavity, glue is injected into the forming cavity through the glue injection port of the lower mold to form the sheet.

[0021] The additional aspects and advantages of the present invention will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, where:

[0023] Figure 1 is a schematic exploded view of the structure of the present invention;

[0024] Figure 2 is a schematic view of the lower die structure of the present invention;

[0025] Figure 3 is a schematic view of the upper die from another perspective of the present invention;

[0026] Figure 4 is a cross-sectional view of the lower die in the front view direction of the present invention;

[0027] Figure 5 is a cross-sectional view of the upper die in the front view direction of the present invention;

[0028] Figure 6 is a schematic view of the upper die in the working state of the present invention;

[0029] Figure 7 is a schematic view of the mold closing state of the present invention;

[0030] Figure 8 is a schematic view of the state when placing the plate of the present invention;

[0031] Figure 9 is a schematic view of the mold closing process of the present invention;

[0032] Figure 10 is a schematic view of the mobile phone case structure of the present invention. Detailed Description of the Specific Embodiment

[0033] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described by referring to the drawings below are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0034] Refer to Figures 1 to 9, a sheet metal forming die, comprising: a lower die 100 provided with a first die cavity 110, the periphery of the first die cavity 110 protruding upward, and the inner wall of the periphery forming a first profiling surface 120, and a card slot 130 is provided outside the first die cavity 110; an upper die 200, including a punch 210 and a second die cavity 220, the punch 210 is located in the second die cavity 220 and can move independently in the direction of the first die cavity 110; a second profiling surface 230 is formed between the outer wall of the punch 210 and the second die cavity 220, and an arc-shaped guiding surface 240 extends downward along the second profiling surface 230, and the tangent at the connection of the guiding surface 240 and the second profiling surface 230 faces the punch 210; wherein, after the die is closed, the guiding surface 240 is closely attached to the card slot 130, and a sealed forming cavity 300 is formed between the first die cavity 110, the second profiling surface 230 and the outer wall of the punch 210.

[0035] In this embodiment, the product takes the mobile phone case 600 as an example. As Figure 10 shown, the mobile phone case 600 includes a bottom plate 610 and an integral side frame 620, and is processed and formed by using an elastic sheet 500; as Figure 8 shown, the sheet 500 is placed above the first die cavity 110, the size of the sheet 500 is larger than the horizontal dimension of the first die cavity 110, the upper die 200 moves downward close to the lower die 100, at this time the punch 210 moves in the direction of the first die cavity 110 relative to the upper die 200 until the punch 210 abuts on the surface of the sheet 500; as Figure 9As shown, the indenter 210 continues to move downward, pressing the sheet 500 into the first cavity 110. At this time, the bottom surface of the sheet 500 abuts against the large plane of the first cavity 110, and the periphery of the sheet 500 is warped upward under the action of the outer wall of the first cavity 110; the indenter 210 remains stationary, and the upper mold 200 continues to move downward. The warped periphery of the sheet 500 will abut against the guiding surface 240; as the upper mold 200 continues to move downward, the periphery of the sheet 500 will be bent and curled along the guiding surface 240, and then the periphery of the sheet 500 will automatically be embedded into the second profiling surrounding surface 230; when the upper mold 200 and the lower mold 100 complete the mold closing, the guiding surface 240 is closely fitted into the card slot 130, and at the same time, a sealed forming cavity 300 is formed between the first cavity 110, the second profiling surrounding surface 230 and the outer wall of the indenter 210. The sheet 500 waits for subsequent forming processing in the forming cavity 300; the cooperation between the first profiling surrounding surface 120 and the second profiling surrounding surface 230 forms the side frame 620 of the mobile phone case 600 after the sheet 500 is formed. The present invention uses the guiding surface 240 to realize the automatic clamping of the sheet 500 into the second profiling surrounding surface 230, eliminating manual operation, optimizing the process time, greatly improving the production efficiency, and preventing the problem of die pressing on the periphery of the sheet 500 during mold closing, ensuring the product quality and avoiding damage to the mold; in addition, the cooperation between the first profiling surrounding surface 120 and the second profiling surrounding surface 230 can prevent the appearance of parting lines on the side frame 620 of the mobile phone case 600 after the product is formed, solving the problem of parting lines that often appear on the side frame 620 in the industry and greatly improving the product quality.

[0036] In some embodiments of the present invention, a limiting post 710 is provided on the first cavity 110 at the corresponding position of the camera hole 630 of the mobile phone case 600, and a jack 720 cooperating with the limiting post 710 is provided on the bottom surface of the indenter 210; generally, a camera hole 630 is provided on the back of the existing mobile phone case 600, and the sheet 500 is preset with a corresponding camera hole 630. The limiting post 710 is provided on the lower mold 100 at the corresponding position of the camera hole 630. During the mold closing process, the limiting post 710 fixes the sheet 500 to prevent the sheet 500 from shifting.

[0037] Specifically, during mold closing, the first profiling surrounding surface 120 and the second profiling surrounding surface 230 are connected with equal radian, and the peripheral side walls of the indenter 210 are arc-shaped, ensuring that no parting line appears on the side frame 620 of the mobile phone case 600 after it is formed.

[0038] In some specific embodiments of the present invention, the sheet forming mold is a hot pressing mold, and further includes a heating device (not shown in the figure). The sheet 500 is formed into the mobile phone case 600 product by hot pressing in the forming cavity 300.

[0039] In some specific embodiments of the present invention, the sheet forming die is an injection mold, and the lower die 100 is provided with a glue injection port 250 communicating with the forming cavity 300. The sheet 500 is injection molded into the mobile phone case 600 product in the forming cavity 300.

[0040] A sheet forming method using the above-mentioned sheet forming die includes the following steps;

[0041] S1: Place the sheet 500 above the first mold cavity 110;

[0042] S2: The upper die 200 moves downward close to the lower die 100, and the pressing head 210 moves towards the first mold cavity 110, pressing the sheet 500 into the first mold cavity 110, so that the periphery of the sheet 500 warps upward; in this step, the pressing head 210 can move towards the first mold cavity 110 while the upper die 200 moves downward close to the lower die 100; or the upper die 200 can move downward close to the lower die 100 by a certain distance and then stop, and then the pressing head 210 moves alone towards the first mold cavity 110;

[0043] S3: The pressing head 210 remains stationary, the upper die 200 moves downward, and the warped periphery of the sheet 500 abuts against the guiding surface 240;

[0044] S4: As the upper die 200 continues to move downward, the periphery of the sheet 500 is bent and curled along the guiding surface 240 towards the second profiling surrounding surface 230 and inserted into the second profiling surrounding surface 230;

[0045] S5: The upper die 200 and the lower die 100 complete the mold closing, and the sheet 500 undergoes a forming processing operation in the forming cavity 300; using the above method, the labor cost is saved, and the forming process time of the sheet 500 is greatly optimized.

[0046] In some specific embodiments of the present invention, when the sheet forming die is a hot pressing die, in step S5, the sheet 500 undergoes a hot pressing forming process in the forming cavity 300, and the sheet 500 is formed into the mobile phone case 600 product through hot pressing.

[0047] In some specific embodiments of the present invention, when the sheet forming die is an injection mold, in step S5, in the forming cavity 300, glue is injected into the forming cavity 300 through the glue injection port 250 of the lower die 100 to form the sheet 500, and the sheet 500 is injection molded into the mobile phone case 600 product.

[0048] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A sheet forming method using a sheet forming die, characterized in that the sheet forming die includes: a lower die (100) provided with a first die cavity (110), the periphery of the first die cavity (110) bulges upward, and the inner wall of the periphery forms a first profiling surface (120), and a card slot (130) is provided outside the first die cavity (110) around it; an upper die (200) including a punch head (210) and a second die cavity (220), the punch head (210) is located in the second die cavity (220) and can move independently in the direction of the first die cavity (110); a second profiling surface (230) is formed between the outer wall of the punch head (210) and the second die cavity (220), and an arc-shaped guiding surface (240) extends downward along the second profiling surface (230), and the tangent at the connection of the guiding surface (240) and the second profiling surface (230) faces the punch head (210); wherein, after the die is closed, the guiding surface (240) is closely attached to the card slot (130), and a sealed forming cavity (300) is formed between the first die cavity (110), the second profiling surface (230) and the outer wall of the punch head (210); the cooperation of the first profiling surface (120) and the second profiling surface (230) is the side frame (620) of the mobile phone case (600) after the sheet (500) is formed; the size of the sheet (500) is larger than the size of the first die cavity (110) in the horizontal plane direction; the sheet forming method includes the following steps: S1: Place the sheet (500) above the first die cavity (110); S2: The upper die (200) moves downward close to the lower die (100), the punch head (210) moves towards the first die cavity (110), and the sheet (500) is pressed into the first die cavity (110) to make the four sides of the sheet (500) tilt upward; S3: The punch head (210) remains stationary, the upper die (200) moves downward, and the tilted periphery of the sheet (500) abuts against the guiding surface (240); S4: As the upper die (200) continues to move downward, the periphery of the sheet (500) bends along the guiding surface (240) towards the second profiling surface (230) and is inserted into the second profiling surface (230); S5: The upper die (200) and the lower die (100) complete die closing, and the sheet (500) undergoes a hot pressing forming process in the forming cavity (300), and the sheet (500) is formed into a mobile phone case (600) through hot pressing treatment.

2. The sheet forming method according to claim 1, characterized in that: At the position corresponding to the camera hole (630) of the mobile phone case (600), the first die cavity (110) is provided with a limiting post (710), and the bottom surface of the punch head (210) is provided with a jack (720) cooperating with the limiting post (710).

3. The sheet forming method according to claim 1, wherein: When the die is closed, the first profiling surface (120) and the second profiling surface (230) are connected with equal radian, and the peripheral side walls of the punch head (210) are arc-shaped.

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