A tool capable of preventing DBC from separating after printing tin paste

Abstract

The utility model discloses a kind of tool that can prevent DBC printing tin paste from separating after, belong to the technical field of DBC printing carrier;Including printing carrier, at least one middle pressing strip and two edge pressing strips;Working groove is opened in printing carrier, a plurality of DBC limiting grooves arranged in array are opened in working groove, a piece of copper clad ceramic chip is placed in each DBC limiting groove;Two edge pressing strips are located at the two sides of working groove, and are used to press the edge of copper clad ceramic chip located at the edge of working groove;Middle pressing strip is located in working groove and between two edge pressing strips, for pressing the edge of copper clad ceramic chip located at the middle position of working groove.The utility model can prevent DBC from separating tool, prevent falling collision and other damage DBC, improve tin paste printing quality simultaneously, ensure the consistency of tin paste thickness, print multiple DBC simultaneously, avoid the danger of hand beating steel net injury, greatly improve printing efficiency, be favorable to the improvement and feasibility of production efficiency.

Description

Technical Field

[0001] This utility model belongs to the technical field of DBC printing carriers, specifically relating to a tooling that can prevent DBC from detaching after solder paste printing. Background Technology

[0002] Solder paste printing is a crucial step in the SMT (Surface Mount Technology) soldering process, and its quality directly affects the reliability of subsequent soldering. Solder paste is precisely deposited onto PCB pads through openings in the stencil / silk screen, providing the physical and electrical foundation for component soldering. This process requires coordination of solder paste characteristics, printing equipment parameters, and operating procedures to achieve high-precision and consistent solder paste deposition.

[0003] Solder paste printing is an essential step before reflow soldering, and its quality directly impacts the ability to produce reliable and compliant products. DBC (copper-clad ceramic wafer) is a ceramic material with double-sided copper cladding. Solder paste printing on the copper layer of the DBC is necessary for soldering it to other products. However, DBCs are lightweight, and after solder paste printing, they are easily pulled detached from the printing carrier by the stencil due to the adhesive properties of the solder paste, leading to damage.

[0004] The original method involved patting the stencil by hand after solder paste printing to prevent the solder paste from sticking to the DBC. This method was inefficient, dangerous, and not feasible for mass production. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned shortcomings in the existing technology by providing a fixture that prevents DBC from detaching after solder paste printing. This solves the problem that the existing method of manually tapping the stencil after solder paste printing to prevent the solder paste from sticking to the DBC is inefficient, dangerous, and not feasible for mass production.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A tooling for preventing DBC solder paste from detaching after printing, comprising a printing carrier, at least one intermediate pressure bar and two edge pressure bars; The printing carrier has a working groove, and several DBC limiting grooves arranged in an array are formed in the working groove. A copper-clad ceramic sheet is placed in each DBC limiting groove. Two edge pressure strips are located on both sides of the working groove and are used to press down the edge of the copper-clad ceramic sheet located at the edge of the working groove. The middle pressure strip is located in the working groove and between the two edge pressure strips, and is used to press down the edge of the copper-clad ceramic sheet located in the middle of the working groove.

[0007] Furthermore, the working groove of the printing carrier is provided with two rows of DBC limiting grooves. The DBC limiting groove is a groove with a downward concave upper surface of the printing carrier. Two adjacent DBC limiting grooves in the same row are spaced apart by two T-shaped protrusions, and the two T-shaped protrusions are arranged opposite each other. A pressing groove is formed between two adjacent T-shaped protrusions in the same row.

[0008] Furthermore, the printing carrier has edge pressing grooves on both sides of the working groove, and a middle pressing groove between the two rows of DBC limiting grooves; the edge pressing strip is placed in the edge pressing groove, and the middle pressing strip is placed in the middle pressing groove.

[0009] Furthermore, at least one positioning groove is provided in both the edge pressing groove and the middle pressing groove.

[0010] Furthermore, at least one positioning block is provided at the bottom of the middle pressure strip and the edge pressure strip, and the positioning block is embedded in the positioning groove.

[0011] Furthermore, the intermediate pressure strip is a strip-shaped structure, with multiple pressure plates spaced apart on both sides of the strip-shaped structure, and a snap-fit ​​groove between two adjacent pressure plates; the pressure plates match the pressing groove.

[0012] Furthermore, the edge pressure strip is a strip-shaped structure, with multiple pressure plates spaced apart on one side of the strip-shaped structure, and a snap-fit ​​groove between two adjacent pressure plates; the pressure plates match the pressing groove.

[0013] Furthermore, a sliding groove is provided on each side of the lower surface of the printing carrier, and the sliding groove is placed on the guide groove of the printing equipment guide rail.

[0014] Furthermore, a reference point is provided at each of the two diagonal positions on the upper surface of the printing carrier.

[0015] The tooling provided by this utility model, which prevents DBC solder paste from detaching after printing, has the following beneficial effects: This invention can prevent DBC from falling or being damaged by collision. It is practical, efficient, and can ensure the printing quality of DBC solder paste. At the same time, multiple DBCs can be printed at one time, improving production efficiency.

[0016] This invention can prevent DBCs from detaching from the fixture and from being damaged by falling or collisions. At the same time, it improves the quality of solder paste printing, ensures the consistency of solder paste thickness, and allows multiple DBCs to be printed at once. It avoids the danger of injury from stencils by hand, greatly improves printing efficiency, and is conducive to improving production efficiency and feasibility. Attached Figure Description

[0017] Figure 1 This is a structural diagram of the printing carrier in this embodiment.

[0018] Figure 2 This is a structural diagram of the intermediate pressure strip and the edge pressure strip in this embodiment.

[0019] Figure 3 This is a structural diagram of the tooling used in this embodiment to prevent the DBC from detaching after solder paste printing.

[0020] Figure 4 This is a structural diagram showing the printing carrier placed inside the guide rail groove of the printing equipment in this embodiment.

[0021] Among them, 1. Printing carrier; 2. Intermediate pressure strip; 3. Copper-clad ceramic sheet; 4. Edge pressure strip; 5. Positioning groove; 6. Reference point; 7. T-shaped protrusion; 8. Pressing groove; 9. DBC limiting groove; 10. Edge pressure strip groove; 11. Intermediate pressure strip groove; 12. Sliding groove; 21. Snap-fit ​​groove; 22. Pressing sheet. Detailed Implementation

[0022] The specific embodiments of this utility model are described below to enable those skilled in the art to understand this utility model. However, it should be understood that this utility model is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes are within the spirit and scope of this utility model as defined and determined by the appended claims, these changes are obvious. All utility model creations utilizing the concept of this utility model are within the scope of protection.

[0023] This embodiment features a fixture that prevents DBCs from detaching after solder paste printing. It prevents DBCs from falling or being damaged by impact, offering good practicality and high efficiency. It ensures the quality of DBC solder paste printing and allows for the printing of multiple DBCs at once, improving production efficiency. (See reference) Figure 3 Specifically, it includes: Printing carrier 1, one central pressure strip 2 and two edge pressure strips 4; In some embodiments, reference Figure 1 The printing carrier 1 has a working groove, and several DBC limiting grooves 9 arranged in an array are located in the working groove. A copper-clad ceramic sheet 3 is placed in each DBC limiting groove 9. Two edge pressure strips 4 are located on both sides of the working groove and are used to press down the edge of the copper-clad ceramic sheet 3 located at the edge of the working groove. The middle pressure strip 2 is located in the working groove and between the two edge pressure strips 4, and is used to press down the edge of the copper-clad ceramic sheet 3 located in the middle of the working groove.

[0024] In one specific embodiment, two rows of DBC limiting grooves 9 are provided in the working groove of the printing carrier 1. The DBC limiting groove 9 is a groove with a downward concave upper surface of the printing carrier 1. Two adjacent DBC limiting grooves 9 in the same row are spaced apart by two T-shaped protrusions 7, and the two T-shaped protrusions 7 are opposite to each other. A pressing groove 8 is formed between two adjacent T-shaped protrusions 7 in the same row.

[0025] In one specific embodiment, the working groove of the printing carrier 1 is provided with edge pressing grooves 10 on both sides, and a middle pressing groove 11 is provided between the two rows of DBC limiting grooves 9. The edge pressing strip 4 is placed in the edge pressing groove 10, and the middle pressing strip 2 is placed in the middle pressing groove 11.

[0026] In one specific embodiment, reference is made to Figure 2 At least one positioning groove 5 is provided in both the edge pressing strip groove 10 and the middle pressing strip groove 11. Preferably, there are two positioning grooves 5, which are located at both ends in the edge pressing strip groove 10 and the middle pressing strip groove 11. The positioning groove 5 is a downwardly recessed groove in the edge pressing strip groove 10 and the middle pressing strip groove 11, which is used to cooperate with the positioning blocks on the edge pressing strip 4 and the middle pressing strip 2, thereby improving the stability of the edge pressing strip 4 and the middle pressing strip 2.

[0027] In one specific embodiment, at least one positioning block (not shown in the figure) is provided at the bottom of the middle pressure strip 2 and the edge pressure strip 4. The positioning block is embedded in the positioning groove 5 to increase the stability of the middle pressure strip 2 in the middle pressure strip groove 11 and the edge pressure strip 4 in the edge pressure strip groove 10.

[0028] In one specific embodiment, the middle pressure strip 2 is a strip structure, and multiple pressure plates 22 are distributed at intervals on both sides of the strip structure. There is a snap-fit ​​groove 21 between two adjacent pressure plates 22, and the pressure plate 22 matches the pressing groove 8.

[0029] In one specific embodiment, the edge pressure strip 4 is a strip structure, and multiple pressure plates 22 are distributed at intervals on one side of the strip structure. There is a snap-fit ​​groove 21 between two adjacent pressure plates 22; the pressure plates 22 match the pressing groove 8.

[0030] In specific operation, taking the intermediate pressure strip 2 as an example, after placing the copper-clad ceramic sheet 3 in the corresponding DBC limiting groove 9, the intermediate pressure strip 2 is placed in the intermediate pressure strip groove 11. Multiple pressure plates 22 on both sides of the intermediate pressure strip groove 11 pass through the pressing groove 8 and cover (press) the edge of the copper-clad ceramic sheet 3. At the same time, the positioning block below the intermediate pressure strip 2 is embedded in the positioning groove 5 in the intermediate pressure strip groove 11, and the snap-fit ​​groove 21 on the intermediate pressure strip 2 engages with the T-shaped protrusion 7. Similarly, the usage process of the edge pressure strip 4 is similar. After the edge pressure strip 4 and the intermediate pressure strip 2 are installed, the upper surface of the printing carrier 1, the upper surface of the copper-clad ceramic sheet 3, the edge pressure strip 4 and the upper surface of the intermediate pressure strip 2 are on the same horizontal plane, ensuring the consistency of the solder paste printing thickness. At the same time, it can also avoid the pulling force of the stencil on the copper-clad ceramic sheet 3 after printing, and prevent the copper-clad ceramic sheet 3 from detaching from the printing carrier 1.

[0031] In one specific embodiment, reference is made to Figure 4A sliding groove 12 is provided on each side of the lower surface of the printing carrier 1. The sliding groove 12 is placed on the guide rail groove of the printing equipment guide rail, so that the printing carrier 1 can move on the guide rail groove.

[0032] In one specific embodiment, a reference point 6 is provided at two diagonal positions on the upper surface of the printing carrier 1 to achieve positioning of the printing carrier 1 and the stencil, ensuring the quality of solder paste printing and preventing deviation.

[0033] In one specific embodiment, the working principle of this embodiment is as follows: The copper-clad ceramic sheet 3 is placed into the DBC limiting groove 9 in sequence, and then the edge pressure strip 4 and the middle pressure strip 2 are placed into the edge pressure strip groove 10 and the middle pressure strip 2, and the copper-clad ceramic sheet 3 is pressed down by the weight of the pressure strip.

[0034] During printing, the printing carrier 1 is placed in the guide rail groove of the printing equipment. The printing equipment can adjust the printing carrier 1 to move on the guide rail. Then, the stencil is aligned with the printing carrier 1 through the reference point 6. After the solder paste is printed, the weight of the pressure strip (pressure sheet 22) presses down on the copper-clad ceramic sheet 3. When the stencil is lifted, the copper-clad ceramic sheet 3 will not detach from the carrier.

[0035] Although the specific embodiments of the utility model have been described in detail with reference to the accompanying drawings, this should not be construed as limiting the scope of protection of this patent. Various modifications and variations that can be made by those skilled in the art without inventive effort within the scope described in the claims still fall within the scope of protection of this patent.

Claims

1. A fixture for preventing DBC solder paste from detaching after printing, characterized in that: Includes a printing carrier, at least one central pressure strip, and two edge pressure strips; The printing carrier has a working groove, and several DBC limiting grooves arranged in an array are formed in the working groove. A copper-clad ceramic sheet is placed in each DBC limiting groove. Two edge pressure strips are located on both sides of the working groove and are used to press down the edge of the copper-clad ceramic sheet located at the edge of the working groove. The middle pressure strip is located in the working groove and between the two edge pressure strips, and is used to press down the edge of the copper-clad ceramic sheet located in the middle of the working groove.

2. The fixture for preventing DBC solder paste from detaching after printing, as described in claim 1, is characterized in that: The printing carrier has two rows of DBC limiting grooves in its working groove. The DBC limiting groove is a groove with a downward concave shape on the upper surface of the printing carrier. Two adjacent DBC limiting grooves in the same row are spaced apart by two T-shaped protrusions, and the two T-shaped protrusions are opposite to each other. A pressing groove is formed between two adjacent T-shaped protrusions in the same row.

3. The fixture for preventing DBC solder paste from detaching after printing, as described in claim 2, is characterized in that: The printing carrier has edge pressing grooves on both sides of the working groove, and a middle pressing groove between the two rows of DBC limiting grooves; the edge pressing strip is placed in the edge pressing groove, and the middle pressing strip is placed in the middle pressing groove.

4. The fixture for preventing DBC solder paste from detaching after printing, as described in claim 3, is characterized in that: At least one positioning groove is provided in both the edge pressing groove and the middle pressing groove.

5. The fixture for preventing DBC solder paste from detaching after printing, as described in claim 4, is characterized in that: The bottom of the middle pressure strip and the edge pressure strip is provided with at least one positioning block, which is embedded in the positioning groove.

6. The fixture for preventing DBC solder paste from detaching after printing, as described in claim 4, is characterized in that: The intermediate pressure strip is a strip-shaped structure, with multiple pressure plates spaced apart on both sides of the strip structure, and a snap-fit ​​groove between two adjacent pressure plates; the pressure plates match the pressing groove.

7. The fixture for preventing DBC solder paste from detaching after printing, as described in claim 4, is characterized in that: The edge pressure strip is a strip-shaped structure, with multiple pressure plates spaced apart on one side of the strip structure, and a snap-fit ​​groove between two adjacent pressure plates; the pressure plates match the pressing groove.

8. The tooling for preventing DBC solder paste from detaching after printing, as described in any one of claims 1 to 7, characterized in that, A sliding groove is provided on each side of the lower surface of the printing carrier, and the sliding groove is placed on the guide rail groove of the printing equipment guide rail.

9. The tooling for preventing DBC solder paste from detaching after printing, as described in any one of claims 1 to 7, characterized in that, A reference point is provided at each of the two diagonal positions on the upper surface of the printing carrier.

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