Middle frame capable of preventing injection molding deformation and electronic equipment

Abstract

The utility model relates to a middle frame capable of preventing injection molding deformation and electronic equipment. The technical problem of injection molding deformation of an existing middle frame is solved. The middle frame capable of preventing injection molding deformation comprises a middle frame blank which comprises a rectangular annular frame, a middle plate block is arranged in the middle of the annular frame, and a concave middle frame mounting groove is formed between the annular frame and the middle plate block; the injection molding structure comprises a first injection molding part annularly arranged on the circumferential inner wall of the middle frame mounting groove and a second injection molding part arranged on the circumferential edge, close to the annular frame, of the middle plate block; the waste blank is arranged along the circumferential edge of the annular frame and horizontally protrudes out of the circumferential edge of the annular frame. According to the middle frame capable of preventing injection molding deformation, the internal stress influence of the injection molding structure on the short edge position of the middle frame blank is reduced, meanwhile, the internal stress of the four corners of the middle frame blank is eliminated or balanced through the second destressing notches, and the injection molding pressure and the mold pressure caused by injection molding are greatly relieved through the third destressing notches.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of middle frame manufacturing, and relates to a middle frame preventing injection molding deformation and electronic equipment. BACKGROUND

[0002] Before injection molding, the overall blank of the middle frame of the mobile phone has strong strength, and is subjected to injection molding pressure, mold pressure and plastic shrinkage force during injection molding; the part after injection molding has internal stress, and the overall strength is gradually weakened and the internal stress is gradually released during post-injection processing, causing the product to bend and deform.

[0003] For example, a middle frame manufacturing method is disclosed in Chinese patent document [201910717200.1], which comprises the following steps: providing a metal profile; performing CNC processing on the metal profile to form a battery compartment and a first stress relief groove; performing CNC processing on the metal profile to form a second stress relief groove; performing CNC processing on the metal profile to form a blank; the blank comprises a frame portion and a middle plate portion located in the frame portion; injection molding is performed on the blank to form a plastic part; the plastic part is located on the frame portion and the middle plate portion; the blank is subjected to CNC processing to remove the residual material on the outside of the blank; the blank is subjected to CNC processing to obtain a formed middle frame.

[0004] The defect of the above technical solution is that although the structural strength is weakened for the profile, the internal stress generated by the injection molding pressure, mold pressure and plastic shrinkage force after injection molding cannot be eliminated, and the diagonal lifting problem is still prone to occur. UTILITY MODEL CONTENTS

[0005] The utility model aims at the above problems existing in the prior art, and provides a middle frame preventing injection molding deformation and electronic equipment.

[0006] The utility model can achieve the purpose by the following technical scheme:

[0007] The middle frame preventing injection molding deformation comprises:

[0008] The middle frame blank comprises a ring-shaped frame in a rectangular shape, a middle plate block is arranged in the middle of the ring-shaped frame, and a recessed middle frame mounting groove is formed between the ring-shaped frame and the middle plate block;

[0009] The injection molding structure comprises a first injection molding part arranged in the circumferential inner wall of the middle frame mounting groove and a second injection molding part arranged on the circumferential edge of the middle plate block close to the ring-shaped frame;

[0010] The waste material blank is arranged along the circumferential edge of the annular frame and protrudes horizontally from the circumferential edge of the annular frame, first stress relief notches are arranged on both side edges of the waste material blank in the short edge direction of the waste material blank, second stress relief notches are arranged on at least one side edge of the waste material blank in the long edge direction of the waste material blank and tend to the corners of the waste material blank, and third stress relief notches are arranged on the waste material blank and communicate the middle frame mounting groove and the second stress relief notches.

[0011] Further, when the widths of the long edge direction of the annular frame on both sides are inconsistent, the second stress relief notches are one and arranged on one side of the long edge direction of the waste material blank with a relatively smaller width.

[0012] Further, when the widths of the long edge direction of the annular frame on both sides are consistent, the second stress relief notches are two and arranged on one side of the long edge direction of the waste material blank, and the two second stress relief notches are arranged on opposite corners of the waste material blank.

[0013] Further, the depth of the third stress relief notch is smaller than the depth of the second stress relief notch.

[0014] Further, the length of the third stress relief notch is smaller than the length of the second stress relief notch.

[0015] Further, the width of the first stress relief notch is smaller than the width of the waste material blank.

[0016] Further, the depth of the first stress relief notch is equal to the depth of the middle frame mounting groove.

[0017] Further, the length of the first stress relief notch is greater than half of the length of the short edge of the waste material blank.

[0018] Further, the middle plate block is arranged with a step close to the circumferential edge of the annular frame, and the width of the injection molding structure arranged on the middle plate block is greater than the width of the step.

[0019] The utility model also provides an electronic equipment with the middle frame of preventing injection molding deformation.

[0020] Compared with the prior art, the middle frame of preventing injection molding deformation weakens the structural strength of the waste material blank in the short edge direction of the waste material blank by designing the first stress relief notch before injection molding, reduces the influence of the internal stress of the injection molding structure on the short edge position of the middle frame blank, eliminates or balances the internal stress of the four corners of the middle frame blank through the second stress relief notch, and greatly relieves the injection molding pressure and the mold pressure caused by injection molding through the design of the third stress relief notch. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The utility model provides a kind of middle frame of preventing injection molding deformation before injection molding schematic.

[0022] Figure 2 The utility model provides a kind of middle frame injection-molded deformation prevention post-injection-molded schematic diagram.

[0023] Figure 3 The utility model provides a kind of middle frame injection-molded deformation prevention cutting waste material blank schematic diagram.

[0024] Figure 4 The utility model provides a kind of middle frame injection-molded deformation prevention double side stress relief schematic diagram.

[0025] In the drawing, 10, middle frame blank;11, annular frame;12, middle plate;13, middle frame mounting groove;14, step;20, injection structure;21, first injection part;22, second injection part;30, waste material blank;31, first stress relief notch;32, second stress relief notch;33, third stress relief notch. DETAILED DESCRIPTION

[0026] Example 1, please refer to Figures 1 to 3 It is a kind of middle frame injection-molded deformation prevention schematic diagram provided by the utility model. The middle frame injection-molded deformation prevention includes: middle frame blank 10, injection structure 20 set on middle frame blank 10 and waste material blank 30 set on the middle frame blank 10, it is conceived that, the middle frame injection-molded deformation prevention also includes functional components and specific structure, for example, electrical connection component, the slot hole of partial installation is set, etc., it is all the technology known to those skilled in the art, so here is not detailed description one by one.

[0027] The external contour of middle frame blank 10 is the finished product size after CNC, specifically including annular frame 11 in rectangular shape, and the circumferential edge of annular frame 11 is divided into long side and short side according to length. The middle part of middle frame mounting groove 13 is provided with recessed middle frame mounting groove 13, and the shape of middle frame mounting groove 13 is close to rectangular slot, which is convenient for injection structure 20 and component installation. The bottom of middle frame mounting groove 13 is middle plate 12 set in the middle part of annular frame 11, and middle plate 12 is internal bearing surface, which can realize electrical connection of positive and negative plate surfaces after slot hole is set on middle plate 12. Because the thickness of middle plate 12 is relatively thin, step 14 is arranged on the circumferential edge of annular frame 11 close to middle plate 12, and in the embodiment, step 14 is mainly arranged in the long side direction of annular frame 11. The connection strength of middle plate 12 is increased by step 14, and the connection level of middle plate 12 is improved.

[0028] In the embodiment, the injection molding structure 20 is injected into the middle frame blank 10 through an injection molding die, and the injection molding structure 20 mainly affects the stress change in the middle frame mounting groove 13. Specifically, the injection molding structure 20 includes a first injection molding part 21 arranged in the circumferential inner wall of the middle frame mounting groove 13, and a second injection molding part 22 arranged at the circumferential edge of the middle plate 12 close to the annular frame 11. The first injection molding part 21 and the second injection molding part 22 are integrally and synchronously injection molded. The width of the second injection molding part 22 arranged on the middle plate 12 is greater than the width of the step 14, so as to increase the contact area between the injection molding structure 20 and the middle frame blank 10, balance the stress of the injection molding structure 20, and reliably ensure the injection molding embedding property. It is conceivable that the injection molding pressure, the die pressure, and the shrinkage force of the injection molding plastic generate the internal stress in the middle frame blank 10.

[0029] It is conceivable that the cutting material reserves a waste material blank 30 outside the middle frame blank 10. The waste material blank 30 is an integral structure with the middle frame blank 10. The waste material blank 30 is arranged along the circumferential edge of the annular frame 11 and protrudes horizontally from the circumferential edge of the annular frame 11, that is, the thickness of the waste material blank 30 is consistent with the thickness of the outermost end of the middle frame blank 10. The waste material blank 30 is cut off after the injection molding is completed. The structure of the waste material blank 30 is increased to increase the external size of the middle frame blank 10, facilitate the connection with the injection molding die to ensure the injection molding sealing property in the middle frame mounting groove 13, and avoid the dirt and scratch problems of the outer surface of the middle frame blank 10.

[0030] In the embodiment, first stress relief notches 31 are arranged in the short side direction of the waste material blank 30. The structural strength of the waste material blank 30 in the short side direction is weakened through the first stress relief notches 31, and the internal stress of the injection molding structure 20 at the short side position of the middle frame blank 10 is reduced. Optimally, the length of the first stress relief notches 31 is greater than half of the length of the short side of the waste material blank 30, so as to reduce the internal stress aggregation of the middle frame blank 10 at the short side position. The depth of the first stress relief notches 31 is equal to the depth of the middle frame mounting groove 13, and the width of the first stress relief notches 31 is less than the width of the waste material blank 30. The corresponding thickness of the waste material blank 30 is reserved to replace the through notches, avoid the internal stress aggregation at the short side corner of the middle frame blank 10, and make the cutting tool more stable and reliable when the waste material blank 30 is cut off.

[0031] At least one edge along the long side of the waste blank 30 is provided with a second stress-relieving notch 32 that is recessed inward and approaches the corner of the waste blank 30. The second stress-relieving notch 32 is used to eliminate or balance the internal stress at the four corners of the middle frame blank 10. In this embodiment, when the widths of the two sides along the long side of the annular frame 11 are inconsistent, there is one second stress-relieving notch 32, which is located on the side of the waste blank 30 with a relatively smaller width. It is conceivable that the middle frame blank 10 with a narrower edge width is more susceptible to internal stress, and the position of the second stress-relieving notch 32 makes it easier to adjust the internal stress balance.

[0032] In other embodiments, please refer to Figure 4 When the width of both sides of the long side of the ring frame 11 is the same, there are two second stress relief notches 32 and they are set on one side of the long side of the waste blank 30. The two second stress relief notches 32 are set at opposite corners of the waste blank 30. The two diagonally designed second stress relief notches 32 can be adjusted in size and position during the design stage according to the internal stress difference of each corner.

[0033] It should be noted that during the preliminary design, a middle frame blank 10 without internal stress notches can be pre-made. After injection molding, the internal stress distribution of the middle frame blank 10 after injection molding can be obtained, and the number and design position of the second stress relief notches 32 can be accurately designed.

[0034] In this embodiment, the waste blank 30 is also provided with a third stress relief notch 33 that connects the middle frame mounting groove 13 and the second stress relief notch 32. The third stress relief notch 33 can serve as an injection overflow port, which can greatly alleviate the injection pressure and mold pressure caused by injection molding.

[0035] The depth of the third stress-relieving notch 33 is less than the depth of the second stress-relieving notch 32, ensuring the sealing of the middle frame mounting groove 13 and not affecting the stress-relieving effect of the second stress-relieving notch 32.

[0036] The length of the third stress relief notch 33 is less than the length of the second stress relief notch 32, so as to prevent the overflowing injection fluid from pressurizing the second stress relief notch 32 during the injection process.

[0037] Example 2: This utility model also provides an electronic device having a mid-frame as described above that prevents injection molding deformation. Except for the mid-frame that prevents injection molding deformation, all other components are existing technology or commercially available parts.

[0038] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A middle frame resistant to injection molding deformation, characterized in that, The application relates to a middle frame blank (10) comprising a ring-shaped frame (11) in a rectangular shape, a middle plate (12) arranged in the middle of the ring-shaped frame (11), and a recessed middle frame mounting groove (13) formed between the ring-shaped frame (11) and the middle plate (12); an injection molding structure (20) comprising a first injection molding part (21) arranged in a ring direction on a circumferential inner wall of the middle frame mounting groove (13) and a second injection molding part (22) arranged on a circumferential edge of the middle plate (12) close to the ring-shaped frame (11); and a waste material blank (30) arranged along a circumferential edge of the ring-shaped frame (11) and protruding horizontally from the circumferential edge of the ring-shaped frame (11), wherein two inwardly recessed first stress relief notches (31) are arranged on two side edges of the waste material blank (30) in a short edge direction of the waste material blank (30), at least one inwardly recessed second stress relief notch (32) is arranged on at least one side edge of the waste material blank (30) in a long edge direction of the waste material blank (30) and close to a corner of the waste material blank (30), and a third stress relief notch (33) is further arranged on the waste material blank (30) and communicates with the middle frame mounting groove (13) and the second stress relief notch (32). When the widths of the ring-shaped frame (11) on two sides in the long edge direction are inconsistent, the second stress relief notch (32) is arranged on one side of the waste material blank (30) in the long edge direction with a relatively smaller width. When the widths of the ring-shaped frame (11) on two sides in the long edge direction are consistent, the second stress relief notch (32) is arranged on one side of the waste material blank (30) in the long edge direction and two second stress relief notches (32) are arranged on opposite corners of the waste material blank (30). The depth of the third stress relief notch (33) is smaller than the depth of the second stress relief notch (32).

2. The middle frame of claim 1, wherein, The length of the third stress relief notch (33) is smaller than the length of the second stress relief notch (32). 3.The middle frame resistant to injection molding deformation according to claim 1, wherein, The width of the first stress relief notch (31) is smaller than the width of the waste material blank (30).

4. The anti-injection-deformation middle frame according to claim 2 or 3, characterized in that, The depth of the first stress relief notch (31) is equal to the depth of the middle frame mounting groove (13).

5. The middle frame of claim 4, wherein, The length of the first stress relief notch (31) is greater than half of the length of the short edge of the waste material blank (30).

6. The middle frame of claim 4, wherein, The middle plate (12) is provided with a step (14) close to the circumferential edge of the ring-shaped frame (11), and the width of the injection molding structure (20) arranged on the middle plate (12) is greater than the width of the step (14).

7. The middle frame of claim 4, wherein, The middle frame is provided with the injection molding deformation prevention structure according to any one of claims 1-9.

8. The middle frame of claim 4, wherein, ​ 9.The middle frame resistant to injection molding deformation of claim 4, wherein, ​ 10. An electronic device, comprising: ​

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