A shell dismounting tool with a fixed structure and an anti-indentation contact surface
By improving the rectangular contact surface and positioning cylindrical array structure of the shell removal tool, the problems of indentation deformation and displacement damage were solved, enabling convenient disassembly and efficient processing of the product.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG XINMENG SEMICON TECH CO LTD
- Filing Date
- 2025-06-11
- Publication Date
- 2026-06-09
AI Technical Summary
Existing shell removal fixtures suffer from indentation deformation, displacement damage, and difficulty in removing parts, which affects product yield and processing efficiency.
It adopts a rectangular contact surface and positioning cylindrical array structure, combined with dovetail groove connection and fine thread hole group, and the product can be removed without obstruction by moving the rod through the handle, avoiding stress concentration and displacement.
It reduces indentation deformation, improves product positioning accuracy and ease of disassembly, extends tooling life, and reduces maintenance costs.
Smart Images
Figure CN224333887U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of semiconductor device processing equipment technology, and in particular to a housing removal tool with a fixed structure and an anti-indentation contact surface. Background Technology
[0002] Existing housing removal fixtures typically employ a cylindrical contact surface structure, using a handle to drive a moving rod to apply vertical pressure and peel off the housing. However, this technology has the following significant drawbacks:
[0003] 1. Indentation damage: The cylindrical contact surface causes stress concentration, resulting in indentations on the copper base plate. The tooling cover is prone to bending deformation after being subjected to force, which affects the product appearance and subsequent processing quality, and reduces the service life of the tooling.
[0004] 2. Displacement and offset problem: Since the entire tooling is separate from the pressing equipment and there is no fastening connection, the tooling cover or base will have a certain displacement or tilt during pressing, which will cause damage to the product DBC. Displacement or tilt is prone to occur during operation, resulting in the DBC substrate breaking.
[0005] 3. Difficulty in removing parts: After the product is pressed, when the copper base plate is to be removed from the tooling base, the copper base plate and the tooling base are tightly joined together. The copper base plate and the tooling base are too tightly joined together, and tools are needed to pry off the copper base plate. There is a risk of scratching the copper base plate when prying it off.
[0006] The aforementioned defects severely restrict the efficiency of shell removal operations and product yield, and there is an urgent need to solve the problem of shell removal tooling structure that seriously affects product yield and processing efficiency. Utility Model Content
[0007] In view of this, in order to solve the problems of indentation deformation, displacement damage and difficulty in removing parts in the existing technology, the purpose of this utility model is to propose a shell removal fixture with a fixed structure and an anti-indentation contact surface for removing product shells. By installing a handle on the pressing device, the handle drives the moving rod on the device to move. During the downward movement, the moving rod applies force to the top cover of the fixture. The rectangular boss at the bottom of the fixture top cover moves downward, driving the product to move. The rectangular boss on the fixture base prevents the pins of the product from moving with the shell, allowing the copper base plate to move downward without obstruction. In this way, the shell, bushing and copper base plate of the product are separated, and the shell and bushing are removed.
[0008] To achieve the above objectives, this utility model provides the following technical solution:
[0009] Based on the above objectives, this utility model provides a shell removal fixture with a fixed structure and an anti-indentation contact surface, including a fixture cover, a fixture base, and a pressing equipment connection mechanism.
[0010] The tooling cover has a rectangular boss and a rectangular contact surface at the bottom, and the rectangular contact surface is in contact with the surface of the product's copper base plate.
[0011] The tooling base surface is provided with a positioning cylinder array that matches the product bushing, and the positioning cylinder array includes at least four protruding positioning columns.
[0012] The pressing equipment connection mechanism includes a first threaded hole group set on the top of the tooling cover and a second threaded hole group set on the bottom of the tooling base. The first threaded hole group and the second threaded hole group are rigidly connected to the pressing equipment actuator through the top cover pin and the base pin, respectively.
[0013] The tooling base is provided with base bosses, and buffer pads are also provided on the working surface of the tooling base between the base bosses, which are fixed by a dovetail groove connection structure.
[0014] As a further embodiment of this utility model, the ratio of the area of the rectangular contact surface to the area of the copper base plate of the product is equal to or greater than 1 / 3 of the surface area of the copper base plate.
[0015] As a further embodiment of this utility model, the aspect ratio of the rectangular contact surface is 2:1-3:1, and the edges of the rectangular contact surface are provided with rounded corners with a radius of 0.5-1.5mm.
[0016] As a further embodiment of this utility model, the raised positioning posts are arranged in a rectangular array, and the raised positioning posts are cylinders with a diameter of 2-5mm. The spacing of the cylinders corresponds to the mounting holes of the product bushing.
[0017] As a further embodiment of this utility model, the height of the cylinder of the positioning cylinder array is 1.2-1.5 times the thickness of the product bushing, and the top of the cylinder is provided with a guide chamfer of 30-45°.
[0018] As a further embodiment of this utility model, the buffer pad and the tooling base are detachably connected by a dovetail groove structure, and the depth of the dovetail groove is 2-3mm.
[0019] As a further embodiment of this utility model, both the first threaded hole group and the second threaded hole group adopt fine threads of M5-M8, and the thread depth is 1.2-1.5 times the bolt diameter.
[0020] As a further embodiment of this utility model, the pressing device actuator includes a pressing device, a moving rod, a handle, and a device base. The handle is installed on the pressing device and connected to the moving rod on the pressing device. The moving rod is connected to the tooling cover, and the device base is connected to the tooling base. When the product shell is removed, the handle installed on the pressing device drives the moving rod on the device to move. During the downward movement of the moving rod, it applies force to the tooling cover. The rectangular boss at the bottom of the tooling cover moves downward, causing the product to move. The rectangular boss on the tooling base prevents the pins of the product from moving with the shell, allowing the copper base plate to move downward without obstruction. This completes the peeling of the product shell, bushing, and copper base plate, thus completing the removal of the shell and bushing.
[0021] As a further embodiment of this utility model, the pressing equipment connection mechanism also includes threaded holes of M5-M8 specifications and matching fastening bolts.
[0022] As a further embodiment of this utility model, the rectangular contact surface of the tooling cover is also coated with a hard anodized layer, with a surface hardness of HV350-400.
[0023] As a further embodiment of this utility model, the buffer pad is an MC nylon buffer pad embedded in the positioning groove on the working surface of the tooling base, with a size of 100×40×5mm and a surface roughness Ra≤3.2μm. The size of the buffer pad is interference-fitted with the positioning groove of the base.
[0024] Compared with the prior art, the shell removal fixture with a fixed structure and an anti-indentation contact surface proposed in this utility model has the following advantages:
[0025] 1. The shell removal fixture of this utility model improves the cylindrical contact surface into a rectangular contact surface with a length-to-width ratio of 2:1-3:1, which reduces the pressing stress, completely eliminates the indentation on the copper base plate surface, and the rounded corner design of the contact surface reduces local stress concentration. Combined with the surface anodized layer, it improves the bending strength of the fixture cover, extends its service life, optimizes the stress distribution, and improves the structural reliability.
[0026] 2. This utility model also employs a positioning cylindrical array combined with guide chamfers to improve the positioning accuracy of the product bushing and reduce the defect rate of DBC corner breakage. The use of fine-threaded hole groups with fastening bolts enhances the shear resistance of the connection between the tooling and the pressing equipment, completely eliminating the tilting problem caused by tooling displacement. Nylon pads are installed using an interference fit dovetail groove, reducing the separation force between the copper base plate and the tooling base, allowing for tool-free removal. The dovetail groove structure allows for quick pad replacement, shortening maintenance time and reducing maintenance costs. This makes the copper base plate easy to disassemble, solving the problems of scratches on the product's copper base plate, DBC corner breakage, and difficulty in removing the copper base plate from the pressing tooling.
[0027] These or other aspects of this application will become more apparent from the following description of embodiments. It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the application. Attached Figure Description
[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or related technologies, the accompanying drawings used in the description of the exemplary embodiments or related technologies will be briefly introduced below. The drawings are used to provide a further understanding of this utility model and constitute a part of the specification. They are used together with the embodiments of this utility model to explain this utility model and do not constitute a limitation on this utility model. In the drawings:
[0029] Figure 1 This is a three-dimensional structural diagram of a shell removal tool with a fixed structure and an anti-indentation contact surface, according to an embodiment of the present utility model.
[0030] Figure 2 This is a front view of a shell removal tool with a fixed structure and an anti-indentation contact surface according to an embodiment of the present utility model.
[0031] Figure 3 This is a schematic diagram of a product for processing a shell removal tooling with a fixed structure and an anti-indentation contact surface, according to an embodiment of the present utility model.
[0032] Figure 4 This is a schematic diagram of the upper cover of a shell removal tool with a fixed structure and an anti-indentation contact surface, according to an embodiment of the present utility model.
[0033] Figure 5 This is a schematic diagram of the tooling base in a shell removal tooling with a fixed structure and an anti-indentation contact surface, according to an embodiment of the present utility model.
[0034] Figure label:
[0035] 1-Tooling top cover, 2-Rectangular boss, 3-Rectangular contact surface, 4-Tooling base, 5-Protruding positioning post, 6-Base boss, 7-First threaded hole group, 8-Second threaded hole group, 9-Pressure pressing equipment actuator, 10-Pressing device, 11-Moving rod, 12-Handle, 13-Equipment base, 14-Buffer pad, 15-Top cover pin, 16-Base pin, 17-Product shell, 18-Product bushing. Detailed Implementation
[0036] The present application will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.
[0037] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model are further described in detail below with reference to specific examples and the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit this application.
[0038] It should be noted that all uses of the terms "first" and "second" in the embodiments of this utility model are for the purpose of distinguishing two different entities or different parameters with the same name. Therefore, "first" and "second" are merely for convenience of expression and should not be construed as limiting the embodiments of this utility model. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, such as other steps or units inherent in a process, method, system, product, or device that includes a series of steps or units.
[0039] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0040] The flowchart shown in the attached diagram is for illustrative purposes only and does not necessarily include all content and operations / steps, nor does it necessarily have to be performed in the order described. For example, some operations / steps can be broken down, combined, or partially merged, so the actual execution order may change depending on the actual situation.
[0041] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0042] See Figures 1 to 5As shown, an embodiment of this utility model provides a shell removal fixture with a fixed structure and an anti-indentation contact surface, including a fixture cover 1, a fixture base 4, and a pressing equipment connection mechanism; the bottom of the fixture cover 1 is provided with a rectangular boss 2 and a rectangular contact surface 3, the rectangular contact surface 3 contacting the surface of the product's copper base plate; the surface of the fixture base 4 is provided with a positioning cylinder array matching the product bushing 18, the positioning cylinder array including at least four raised positioning pins 5; the pressing equipment connection mechanism includes a first threaded hole group 7 provided on the top of the fixture cover 1 and a second threaded hole group 8 provided on the bottom of the fixture base 4, the first threaded hole group 7 and the second threaded hole group 8 being rigidly connected to the pressing equipment execution mechanism 9 by a cover pin 15 and a base pin 16 respectively; the fixture base 4 is provided with a base boss 6, and a buffer pad 14 is also provided on the working surface of the fixture base 4 between the base bosses 6, which is fixed by a dovetail groove connection structure.
[0043] In this embodiment, the area ratio of the rectangular contact surface 3 to the contact area of the copper base plate of the product is equal to or greater than 1 / 3 of the surface area of the copper base plate. The aspect ratio of the rectangular contact surface 3 is 2:1-3:1, and the edges of the rectangular contact surface 3 are rounded with a radius of 0.5-1.5 mm.
[0044] The outer shell removal fixture of this utility model improves the cylindrical contact surface into a rectangular contact surface 3 with a length-to-width ratio of 2:1-3:1, which reduces the pressing stress, completely eliminates the indentation on the copper base plate surface, and the rounded corner design of the contact surface reduces local stress concentration. Combined with the surface anodized layer, it improves the bending strength of the fixture cover 1, extends its service life, optimizes the stress distribution, and improves the structural reliability.
[0045] In this embodiment, the product is a power semiconductor module (such as an IGBT module, SiC module, etc.) with a copper base plate as the heat dissipation substrate and an internal DBC ceramic circuit board. The product includes a product housing 17 and a product bushing 18. The raised positioning posts 5 are arranged in a rectangular array. The raised positioning posts 5 are cylinders with a diameter of 2-5mm, and the spacing of the cylinders corresponds to the mounting holes of the product bushing 18. The height of the cylinders in the positioning cylinder array is 1.2-1.5 times the thickness of the product bushing 18, and the top of the cylinders is provided with a guide chamfer of 30-45°.
[0046] In this embodiment, the buffer pad 14 and the tooling base 4 are detachably connected via a dovetail groove structure, the depth of which is 2-3mm. The buffer pad 14 is an MC nylon buffer pad 14 embedded in a positioning groove on the working surface of the tooling base 4, measuring 100×40×5mm with a surface roughness Ra≤3.2μm. The dimensions of the buffer pad 14 are interference-fitted with the positioning groove of the base.
[0047] In this embodiment, both the first threaded hole group 7 and the second threaded hole group 8 use fine threads of M5-M8, with a thread depth of 1.2-1.5 times the bolt diameter. The pressing equipment connection mechanism also includes threaded holes of M5-M8 specifications and matching fastening bolts. The pressing device actuator 9 includes a pressing device 10, a moving rod 11, a handle 12, and a device base 13. The pressing device 10 is equipped with a handle 12, which is connected to the moving rod 11. The moving rod 11 is connected to the tooling cover 1, and the device base 13 is connected to the tooling base 4. When the product shell is removed, the handle 12 installed on the pressing device 10 drives the moving rod 11 on the device to move. During the downward movement, the moving rod 11 applies force to the tooling cover 1. The rectangular boss 2 at the bottom of the tooling cover 1 moves downward, causing the product to move. The base boss 6 on the tooling base 4 prevents the pins and shell of the product from moving, allowing the copper base plate to move downward without obstruction. This completes the peeling of the product shell, bushing, and copper base plate, thus removing the shell and bushing.
[0048] In this embodiment, the rectangular contact surface 3 of the tooling cover 1 is also coated with a hard anodized layer, with a surface hardness of HV350-400.
[0049] This utility model also employs a positioning cylindrical array combined with guide chamfers to improve the positioning accuracy of the product bushing 18 and reduce the defect rate of DBC corner breakage. The use of fine-threaded hole groups with fastening bolts enhances the shear resistance of the connection between the tooling and the pressing equipment, completely eliminating tilting problems caused by tooling displacement. Nylon pads are installed using an interference fit dovetail groove, reducing the separation force between the copper base plate and the tooling base 4, allowing for tool-free removal. The dovetail groove structure allows for quick pad replacement, shortening maintenance time and reducing maintenance costs. This makes the copper base plate easy to disassemble, solving problems such as scratches on the product's copper base plate, DBC corner breakage, and difficulty in removing the copper base plate from the pressing tooling.
[0050] The above are exemplary embodiments disclosed in this utility model. However, it should be noted that various changes and modifications can be made without departing from the scope of the embodiments of this utility model as defined by the claims. The functions, steps, and / or actions of the methods according to the disclosed embodiments described herein do not need to be performed in any particular order. Furthermore, although the elements disclosed in the embodiments of this utility model may be described or claimed individually, they may be understood as multiple unless explicitly limited to a singular number.
[0051] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Within the framework of the present invention, technical features of the above embodiments or different embodiments can also be combined, and many other variations of different aspects of the present invention exist, which are not provided in the details for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A housing removal tool with a fixed structure and an anti-indentation contact surface, characterized in that, Includes a tooling cover (1), a tooling base (4), and a pressing equipment connection mechanism; The tooling cover (1) has a rectangular boss (2) and a rectangular contact surface (3) at the bottom, and the rectangular contact surface (3) is in contact with the surface of the copper base plate of the product. The tooling base (4) has a positioning cylinder array that matches the product bushing (18) on its surface. The positioning cylinder array includes at least four protruding positioning columns (5). The pressing equipment connection mechanism includes a first threaded hole group (7) set on the top of the tooling cover (1) and a second threaded hole group (8) set on the bottom of the tooling base (4). The first threaded hole group (7) and the second threaded hole group (8) are rigidly connected to the pressing equipment actuator (9) through the cover pin (15) and the base pin (16), respectively. The tooling base (4) is provided with a base boss (6), and a buffer pad (14) is also provided on the working surface of the tooling base (4) between the base bosses (6), which is fixed by a dovetail groove connection structure.
2. The housing removal fixture with a fixed structure and an anti-indentation contact surface as described in claim 1, characterized in that, The ratio of the area of the rectangular contact surface (3) to the area of the copper base plate of the product is equal to or greater than 1 / 3 of the surface area of the copper base plate.
3. The housing removal fixture with a fixed structure and an anti-indentation contact surface as described in claim 2, characterized in that, The aspect ratio of the rectangular contact surface (3) is 2:1-3:1, and the edges of the rectangular contact surface (3) are provided with rounded corners with a radius of 0.5-1.5mm.
4. The housing removal fixture with a fixed structure and an anti-indentation contact surface as described in claim 1, characterized in that, The raised positioning posts (5) are arranged in a rectangular array. The raised positioning posts (5) are cylinders with a diameter of 2-5mm. The spacing of the cylinders corresponds to the mounting holes of the product bushing (18).
5. The housing removal fixture with a fixed structure and an anti-indentation contact surface as described in claim 4, characterized in that, The height of the cylinders in the positioning cylinder array is 1.2-1.5 times the thickness of the product bushing (18), and the top of the cylinders is provided with a guide chamfer of 30-45°.
6. The housing removal fixture with a fixed structure and an anti-indentation contact surface as described in claim 1, characterized in that, The buffer pad (14) and the tooling base (4) are detachably connected by a dovetail groove structure, and the depth of the dovetail groove is 2-3mm.
7. The housing removal fixture with a fixed structure and an anti-indentation contact surface as described in claim 6, characterized in that, The first threaded hole group (7) and the second threaded hole group (8) both adopt fine threads of M5-M8, and the thread depth is 1.2-1.5 times the bolt diameter.
8. The housing removal fixture with a fixed structure and an anti-indentation contact surface as described in claim 7, characterized in that, The pressing device actuator (9) includes a pressing device (10), a moving rod (11), a handle (12), and a device base (13). The pressing device (10) is equipped with a handle (12), which is connected to the moving rod (11) on the pressing device (10). The moving rod (11) is connected to the tooling cover (1), and the device base (13) is connected to the tooling base (4).
9. The housing removal fixture with a fixed structure and an anti-indentation contact surface as described in claim 8, characterized in that, The pressing equipment connection mechanism also includes M5-M8 threaded holes and matching fastening bolts.
10. The housing removal fixture with a fixed structure and an anti-indentation contact surface as described in claim 1, characterized in that, The buffer pad (14) is an MC nylon buffer pad (14) embedded in the positioning groove on the working surface of the tooling base (4). It is 100×40×5mm in size and has a surface roughness Ra≤3.2μm. The size of the buffer pad (14) is interference fit with the positioning groove of the base.