Demolding jig
Through the design of the mold release fixture, the combination of the ejection block and the limit hole is used to solve the problem of pin damage during chip disassembly, and efficient and stable chip release is achieved, reducing the defect rate.
Patent Information
- Application Number
- CN202422149201.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-02
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-09-02
AI Technical Summary
During electronic manufacturing and semiconductor packaging, the chip's pins are prone to deform or break during disassembly, resulting in an increase in the defective yield rate.
The mold release fixture is used to provide upward thrust through the ejection block on the ejection plate and downward pressure is provided through the limit hole on the limit cover plate. It cooperates with the guide column and guide hole to ensure that the chip is stable off the substrate and avoids direct contact with the chip pins.
It achieves efficient and stable mold release of the chip, reduces the defect rate and improves production efficiency.
Smart Images
Figure CN223123872U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of fixtures, in particular to a demolding fixture. Background Art
[0002] In the fields of electronic manufacturing and semiconductor packaging, a pre-tinning treatment process is usually carried out on chips to enhance the adhesion of the solder joints of the chips so as to make the welding more firm. However, sometimes due to the strong adhesion between the flux in the solder paste and the PCB board, it is not easy to separate the chip from the PCB, and it is necessary to manually pry the chip loose from the PCB with tweezers and then take it out. But in the operation process, it is very easy to cause the deformation of the chip pins, and even the pins may be broken and scrapped, resulting in defective products that need to be repaired. Summary of the Utility Model
[0003] The purpose of the utility model is to provide a demolding fixture to avoid damage to the pins of the chip during the disassembly process and reduce the defective rate.
[0004] To achieve the above purpose, the utility model provides the following technical solutions:
[0005] A demolding fixture is used for disassembling a chip on a substrate having at least one reserved hole, and the chip is arranged above the reserved hole. The demolding fixture includes: a top plate arranged below the substrate, and a top block corresponding to the reserved hole is arranged on the top plate for providing an upward thrust to the chip; and a limit cover plate arranged above the substrate for providing a downward pressure to the substrate, and a limit hole corresponding to the chip is arranged on the limit cover plate. The diameter of the limit hole is larger than the diameter of the chip. Wherein, the limit hole of the limit cover plate is sleeved on the chip, and the top block on the top plate passes through the reserved hole to apply a thrust to the chip so as to make the chip separate from the substrate.
[0006] Preferably, guiding columns are symmetrically arranged on the top plate, and guiding holes are arranged on both the substrate and the limit cover plate for installing the guiding columns.
[0007] Preferably, a plurality of reserved holes, a plurality of top blocks and a plurality of limit holes are provided.
[0008] Preferably, the plurality of reserved holes, the plurality of top blocks and the plurality of limit holes are arranged in a rectangular array.
[0009] Preferably, the reserved holes, the top blocks and the limit holes are all rectangular.
[0010] Preferably, the top block is arranged in a convex shape on the top plate.
[0011] Preferably, the ejector block and the ejector plate are integrally formed.
[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows: The demolding method realized by this demolding jig is simple and efficient, and can demold multiple chips simultaneously. Moreover, the position of the chip is restricted by the limiting holes on the limiting cover plate, avoiding displacement of the chip during demolding and causing unnecessary damage, which well solves the deficiencies in the background art, has high efficiency, and effectively reduces the defective rate of products. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 FIG. 1 is a schematic diagram of the overall structure of the demolding jig according to an embodiment of the present utility model;
[0014] Figure 2 FIG. 2 is a schematic diagram of the substrate structure according to an embodiment of the present utility model;
[0015] Figure 3 FIG. 3 is a schematic diagram of the ejector plate structure according to an embodiment of the present utility model;
[0016] Figure 4 FIG. 4 is a schematic diagram of the limiting cover plate structure according to an embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0017] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.
[0018] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.
[0019] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.
[0020] Furthermore, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality of" means two or more, unless otherwise specifically defined.
[0021] Figures 1 to 4 is a schematic diagram of the demoulding fixture according to the embodiment of the present utility model. Refer to Figures 1 - 4, the demolding fixture includes an ejector plate 3 and a limit cover plate 4, which are used to remove the chip 2 on the substrate 1 having at least one reserved hole 101, and the chip 2 is arranged above the reserved hole 101. The shape of the reserved hole on the substrate 1 can be rectangular, square, triangular and other shapes, which can be set according to the actual type of the chip 2. For example, if the chip 2 is a rectangular chip at this time, the reserved hole can be set as a rectangle. The substrate 1 is mainly used for mounting the chip 2, and the mounting position is above the reserved hole. The mounting method can be printing plus reflow soldering, specifically: first, solder paste is printed on the substrate 1, and then the chip 2 is mounted above the reserved hole 101 of the substrate 1 through an SMT device (SMT, the abbreviation of Surface Mounted Technology, Chinese: Surface Mounted Technology), and then reflow soldering is carried out to complete the mounting of the chip 2. An ejector plate 3 is provided below the substrate 1, and an ejector block 301 corresponding to the reserved hole 101 is provided on the ejector plate 3 to provide an upward thrust for the chip 2. As a preferred implementation manner, the ejector block 301 is convexly arranged on the ejector plate 3 to facilitate the ejection of the chip 2 by the ejector block 301. After the chip 2 is mounted on the substrate 1, the ejector plate 3 ejects the chip 2 upward through the ejector block 301 from below. In addition, a limit cover plate 4 is further provided above the substrate 1 to provide a downward pressure on the substrate 1, and a limit hole 401 corresponding to the chip 2 is provided on the limit cover plate 4. The main function of the limit hole 401 is to limit the position of the chip 2. In order to avoid the influence of the limit hole on the chip, the diameter of the limit hole 401 is usually set to be larger than the diameter of the chip 2 to prevent the chip 2 from being displaced during demolding, causing unnecessary damage. Moreover, in order to avoid too large a difference in diameter between the two, the diameter of the limit hole 401 can be designed to be slightly larger than the diameter of the chip 2 during design. As can be seen from the above, the whole process of demolding using the demolding fixture is as follows: after the chip 2 is mounted on the substrate 1, the limit cover plate 4 is sleeved on the chip 2 through the limit hole 401 to provide a downward pressure on the substrate 1 to ensure the stability during chip demolding. Finally, the ejector plate 3 below the substrate 1 ejects the chip 2 through the ejector block 301 after passing through the reserved hole 101 to separate the chip 2 from the substrate 1 to complete the demolding operation. During this process, the operator does not need to touch the pins of the chip 2, thus avoiding damage to the pins. At the same time, this demolding method is simple and efficient, can be carried out on multiple chips 2 at the same time, has high efficiency and effectively reduces the product defect rate.
[0022] Next, in order to accurately eject the chip 2 by the ejector block 301 on the ejector plate 3, refer to Figures 2 - 4, guide posts 302 are symmetrically provided on the ejector plate 3. Guide holes 5 are provided on both the base plate 1 and the limit cover plate 4. The guide holes 5 are used to install the guide posts 302. The arrangement of the guide holes 5 is the same as that of the guide posts 302. The guide holes 5 on the base plate 1 and the limit cover plate 4 are both symmetrically arranged. When the ejector plate 3 is in use, the guide posts 302 will sequentially pass through the base plate 1 and the limit cover plate 4 along the guide holes 5 to realize the movable installation of the ejector plate 3 on the base plate 1. At the same time, when the guide posts 302 are completely inserted into the guide holes 5, the ejector block 301 will complete the ejection of the chip 2 during this process.
[0023] Then, in order for the demoulding jig to separate more chips 2 at one time, refer to Figures 2 - 4 , as a preferred embodiment, a plurality of reserved holes 101, ejector blocks 301 and limit holes 401 are provided. Moreover, in order to simplify the production process and improve the aesthetics, the plurality of reserved holes 101, the plurality of ejector blocks 301 and the plurality of limit holes 401 are all arranged in a rectangular array. Moreover, in the rectangular array, the row and column spacing can be adjusted according to the size of the actually processed chip 2 to adapt to chips 2 of different sizes and improve the versatility and flexibility of the jig. Further, in order to improve the smoothness and stability of the cooperation between the reserved holes 101, the ejector blocks 301 and the limit holes 401, their shapes can be set to be the same. For example, the reserved holes 101, the ejector blocks 301 and the limit holes 401 can all be set to be rectangular, circular or other shapes.
[0024] In addition, in order to enhance the structural strength between the ejector block 301 and the ejector plate 3 and extend the service life, the ejector block 301 and the ejector plate 3 are integrally formed. Injection molding technology can be used to achieve integral molding to reduce the manufacturing cost and improve the production speed.
[0025] According to the disclosure and teachings of the above specification, those skilled in the art to which the present invention pertains can also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above. Some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present invention.
Claims
1. A demolding fixture for removing a chip (2) from a substrate (1) having at least one reserved hole (101), and the chip (2) is disposed above the reserved hole (101), characterized in that, Including: An ejector plate (3) is arranged below the substrate (1). An ejector block (301) corresponding to the reserved hole (101) is provided on the ejector plate (3) for providing an upward thrust to the chip (2). And A limit cover plate (4) is arranged above the substrate (1) for providing a downward pressure to the substrate (1). A limit hole (401) corresponding to the chip (2) is provided on the limit cover plate (4), and the diameter of the limit hole (401) is larger than the diameter of the chip (2). Wherein, the limit hole (401) of the limit cover plate (4) is sleeved on the chip (2), and the ejector block (301) on the ejector plate (3) passes through the reserved hole (101) to apply a thrust to the chip (2) so that the chip (2) is separated from the substrate (1).
2. The demolding fixture according to claim 1, wherein Guide posts (302) are symmetrically arranged on the ejector plate (3), and guide holes (5) are provided on both the substrate (1) and the limit cover plate (4) for installing the guide posts (302).
3. The demolding fixture according to claim 1, wherein A plurality of the reserved holes (101), the ejector blocks (301), and the limit holes (401) are provided.
4. The demolding fixture according to claim 3, characterized in that, The plurality of reserved holes (101), the plurality of ejector blocks (301), and the plurality of limit holes (401) are all arranged in a rectangular array.
5. The demolding jig according to claim 1, wherein The reserved holes (101), the ejector blocks (301), and the limit holes (401) are all rectangular.
6. The demolding fixture according to claim 1, wherein The ejector block (301) is provided in a convex shape on the ejector plate (3).
7. The demolding fixture according to claim 1, wherein The ejector block (301) and the ejector plate (3) are integrally formed.