A Negative Pressure Positioning Sintering Tooling for Microwave Boards and Epoxy Boards and Its Usage Method

Abstract

The present invention relates to a negative pressure positioning sintering tool for microwave boards and epoxy boards and a method for use. The tool includes an epoxy board sintering base, a limiting pressure block, and a magnetic suction head. The sintering part consists of two parts: a sintering base and a microwave board limiting pressure block. The magnetic joint serves as a vacuum interface and does not participate in high-temperature sintering. ① The sintering base consists of: a sintering pad, a tension spring, and a connecting rod; ② The microwave board limiting pressure block consists of a sintering pressure block, a sealing cover plate, a samarium cobalt magnetic ring, and a load rod; ③ The magnetic suction head consists of: a suction head, a sealing ring, and a samarium cobalt magnetic ring. The microwave board limiting pressure block effectively constrains the microwave board through vacuum negative pressure. When the microwave board limiting pressure block and the sintering base are assembled, the microwave board and the epoxy board can be accurately positioned. A pressure spring is used to ensure that when the solder is melted, the sintering pressure block can continuously apply effective fastening force to the printed circuit board and the metal shell. The sintering device is suitable for general hot stage sintering processes and reflow soldering sintering processes.

Description

Technical Field

[0001] The invention relates to a negative pressure positioning sintering tool for a microwave plate and an epoxy plate and a use method thereof, belonging to the technical field of microwave electronics. Background Art

[0002] The rapid development of electronic products has put pressure on miniaturization, high reliability, and low cost. To ensure microwave performance, the microwave board and epoxy board must be precisely aligned. Microwave boards are thin, typically only 0.254mm thick, and their soft material and associated warping make alignment difficult. Large positioning deviations can easily lead to rework or scrapping of the sintered product. Therefore, sintering blocks are used to effectively constrain the microwave board and epoxy board during sintering, ensuring precise alignment and reliable sintering, thereby reducing scrap and saving costs. Summary of the Invention

[0003] The present invention proposes a microwave board and epoxy board negative pressure positioning sintering tool and a method of use, the purpose of which is to address the shortcomings of the above-mentioned background technology and provide a microwave board and epoxy board negative pressure positioning sintering tool and a method of use with high reliability, simple structure and convenient operation.

[0004] The technical solution of the present invention is a negative pressure positioning sintering tool for a microwave plate and an epoxy plate, the structure of which includes an epoxy plate sintering base, a microwave plate limiting pressure block, a magnetic suction head and a vacuum device, wherein the epoxy plate sintering base includes a sintering base, a tension spring, and two connecting rods. Screws are provided at the four corners of the sintering base, and screws are provided at both ends of the connecting rod. The tension springs at both ends of the connecting rod are assembled with screws and assembled with the two sides of the sintering base respectively; the microwave plate limiting pressure block includes a limiting pressure block, a limiting pressure block samarium cobalt magnetic ring, and a load rod. An assembly hole is opened on one side of the limiting pressure block, and threaded holes are provided on the adjacent two sides. The load rods are fixed by screws respectively. A limiting pressure block samarium cobalt magnetic ring is installed inside the limiting pressure block, and the limiting pressure block samarium cobalt magnetic ring is concentric with the assembly hole. The bottom plate of the sintering pressure block is provided with a hollow structure; the magnetic suction head includes a suction head, a sealing ring, a magnetic suction head samarium cobalt magnetic ring. The suction head is a flange structure, and a sealing ring and a magnetic suction head samarium cobalt magnetic ring are provided on the flange surface. The other end is connected to the vacuum device;

[0005] When in use, from top to bottom are the microwave plate limiting pressure block, microwave plate, epoxy plate, and epoxy plate sintered base. The magnetic suction head is inserted into the assembly hole of the limiting pressure block. The samarium cobalt magnetic ring of the limiting pressure block and the samarium cobalt magnetic ring of the magnetic suction head are matched and tightened. The limiting pressure block generates negative pressure constraint on the microwave plate through the vacuum device. The connecting rod in the epoxy plate sintered base is buckled on the load rod of the microwave plate limiting pressure block to fix the tooling as a whole.

[0006] The magnetic joint is removed after the tooling is fixed as a whole, and the magnetic joint does not participate in high-temperature sintering.

[0007] The limiting pressure block is a cavity structure with supporting reinforcement ribs inside and holes opened on the sides of the supporting reinforcement ribs to ensure that each cavity is connected.

[0008] Arc-shaped grooves are provided at both ends of the load rod. During assembly, the connecting rod is buckled into the grooves of the load rod to fix the connection.

[0009] The restraining surface of the limiting pressing block is processed with a groove according to the shape of the microwave board, and the depth of the groove is 1 / 2 of the thickness of the microwave board.

[0010] The constraint surface of the sintered base is processed into a limiting cavity according to the shape of the epoxy plate, and the limiting cavity of the sintered base and the epoxy plate are clearance-matched.

[0011] The outer diameter of the suction head matches the diameter of the assembly hole.

[0012] The hollow structure is a 0.5-2 mm hole opened in the limiting cavity and penetrates the cavity of the limiting pressure block, and the hole spacing is 2-10 times the hole diameter.

[0013] The method of use includes the following steps:

[0014] (1) Place the epoxy plate into the sintering base;

[0015] (2) Place the microwave board under the limiting pressure block and insert the suction head to complete the positioning constraint of the microwave board by the limiting pressure block;

[0016] (3) Coating solder on the welding surface of microwave board;

[0017] (4) Place the microwave plate limiting block into the epoxy plate sintering base, buckle the connecting rod into the load connecting rod, remove the magnetic suction head, and complete the sintering assembly of the microwave plate and the epoxy plate;

[0018] (5) Complete the high-temperature welding of the microwave board and the epoxy board.

[0019] Beneficial effects of the present invention:

[0020] 1) Vacuum negative pressure is used to constrain the microwave board. This negative pressure ensures a tight fit between the microwave board and the retaining block, facilitating precise positioning of the microwave board and epoxy board. A tension spring connecting rod applies pressure to the retaining block, ensuring that the sintering block maintains effective fastening force between the printed circuit board and the metal housing while the solder melts. This sintering device is suitable for both general hot-plate sintering processes and reflow soldering processes.

[0021] 2) Effectively improve the reliability of sintering of microwave boards and epoxy boards, improve the yield rate and production efficiency, and is suitable for sintering of microwave boards and epoxy boards in the field of microwave electronics. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Attachment Figure 1 This is the assembly drawing of the negative pressure positioning sintering tooling.

[0023] Attachment Figure 2 This is the assembly drawing of the microwave board limit block.

[0024] Attachment Figure 3 This is the assembly drawing of the epoxy plate sintered base.

[0025] Attachment Figure 4 This is the magnetic suction head assembly diagram.

[0026] Attachment Figure 5 It is a diagram of the inner cavity of the sintered compact.

[0027] Attachment Figure 6 It is a schematic diagram of the overall structure of the negative pressure positioning sintering tooling.

[0028] In the figure, 1 is the microwave board, 2 is the epoxy board, 3 is the epoxy board sintered base, 4 is the microwave board limit pressure block, 5 is the load rod, 6 is the limit pressure block, 7 is the screw, 8 is the connecting rod, 9 is the screw, 10 is the tension spring, 11 is the sintered base, 12 is the sealing ring, 13 is the samarium cobalt magnetic ring, and 14 is the suction head. DETAILED DESCRIPTION

[0029] The technical solution of the present invention is further described below with reference to the accompanying drawings.

[0030] As attached Figure 1-4 As shown, a negative pressure positioning sintering tool for microwave boards and epoxy boards includes an epoxy board sintering base, a limiting pressure block, and a magnetic suction head. The sintering part consists of two parts: the sintering base and the microwave board limiting pressure block. The magnetic joint serves as a vacuum interface and does not participate in high-temperature sintering. ① The sintering base consists of a sintering pad, a tension spring, and a connecting rod; ② The microwave board limiting pressure block consists of a sintering pressure block, a sealing cover plate, a samarium cobalt magnetic ring, and a load rod; ③ The magnetic suction head consists of a suction head, a sealing ring, and a samarium cobalt magnetic ring. The microwave board limiting pressure block effectively constrains the microwave board through vacuum negative pressure. When the microwave board limiting pressure block and the sintering base are assembled, the microwave board and the epoxy board can be accurately positioned. A pressure spring is used to ensure that when the solder is melted, the sintering pressure block can continuously apply effective fastening force to the printed circuit board and the metal shell. The sintering device is suitable for general hot stage sintering processes and reflow soldering sintering processes.

[0031] In the above solution, the sintered base, the microwave plate limiting block, and the magnetic suction head need to be pre-assembled and used as independent components.

[0032] As attached Figure 5 As shown, in the above solution, the sintered compact is a cavity structure and is provided with supporting reinforcement ribs. Through holes are provided in the middle of the reinforcement ribs to connect the cavities, so that the cavities are connected without losing strength.

[0033] As attached Figure 3As shown, the sintered compact has a hole on one side for docking with the magnetic pickup, and threaded holes on the adjacent sides for mounting the load rod. Arc-shaped grooves are provided at both ends of the load rod. When assembled with the sintered base, the connecting rod is engaged by a tension spring, locking into the groove. This prevents disengagement and assembly failure. The arc-shaped grooves also facilitate quick assembly and disassembly.

[0034] The microwave plate constraint surface of the sintered compact is processed into a groove according to the shape of the microwave plate, which is used for positioning the microwave plate in the plane direction.

[0035] The samarium-cobalt magnetic ring is concentrically bonded to the outward-facing opening on the side of the sintered compact using high-temperature resistant epoxy adhesive, ensuring it will not fall off or shift during use. After the samarium-cobalt magnetic ring and sintered compact are assembled, the sintered compact sealing cover is assembled and laser welded to form a single, integrated component.

[0036] The magnetic suction head needs to be connected to an external vacuum device to provide negative pressure to the microwave plate for sintering the compact.

[0037] The sintering base is equipped with an epoxy plate limiting cavity. The shape of the cavity has a single-side gap of 0.03 to 0.1 mm with the maximum outer shape of the epoxy plate. This can effectively optimize the problems of the epoxy plate and the sintering base being stuck due to thermal expansion and contraction during the sintering process, or positioning failure caused by excessive gaps.

[0038] Arc-shaped grooves are provided at both ends of the load rod, so that the connecting rod can be sunk into the groove, thereby realizing high-reliability elastic constraint of the microwave plate limiting pressure block. The elastic constraint connecting rod can be quickly disassembled during use.

[0039] The microwave plate's restraining surface is grooved to the plate's contour, effectively positioning the plate against the plate's retaining block. The depth of the retaining block's groove is half the plate's thickness, satisfying both planar and longitudinal constraints while ensuring the block's effective compaction against the epoxy board.

[0040] The sintered compact is equipped with a samarium-cobalt magnetic ring, which is concentric with the side opening to facilitate the quick assembly of the magnetic suction head.

[0041] The microwave plate limit block is made of a samarium cobalt magnetic ring, assembled with a sealing cover and a load rod, and can be used as an independent component.

[0042] The sintered base is composed of a sintered base, a tension spring, and a connecting rod; it is used as an independent component during use.

[0043] The magnetic suction head consists of a suction head, a sealing ring, and a samarium cobalt magnetic ring, and is used as an independent component during use.

[0044] In the above solution, the sintered base is provided with a limiting cavity for placing the epoxy board, which is used to position the epoxy board and ensure that the microwave board and the epoxy board are accurately positioned when the microwave board limiting pressure block is assembled with the sintered base.

[0045] The sintering block's shape and the epoxy plate's retaining cavity are designed to form a clearance fit, with a single-side gap of 0.05 to 0.2 mm. This ensures precise positioning while preventing metal expansion and deformation at high temperatures, which could cause the block to become stuck to the base and affect the sintering effect. One end of the magnetic suction head must be connected to a vacuum device to provide continuous negative pressure to the tooling. The outer diameter of the suction head must match the diameter of the opening on one side of the sintering block to ensure smooth assembly and a certain degree of sealing, ensuring sufficient suction to hold the microwave plate.

[0046] The microwave board limiting block has a groove with 0.5~2mm holes penetrating the back cavity, and the hole spacing varies from 2 to 10 times the aperture. The microwave board can be effectively adsorbed through the small holes, so that it is firmly constrained in the limiting block groove.

[0047] After connecting the magnetic suction head to the vacuum device, insert it into the side hole of the microwave plate limiter. This creates a negative pressure constraint on the microwave plate, ensuring a tight fit. After assembling the microwave plate and limiter, apply solder. After assembling the microwave plate limiter and sintering base, snap the connecting rod into the groove of the load rod and remove the magnetic suction head to complete the assembly.

[0048] The sintering block and sintering base, constrained by tension springs, continuously apply a tightening force to the microwave board and epoxy board, ensuring consistent binding. The assembly process requires no accessories or tools, enabling quick assembly and disassembly, improving production efficiency. The assembled tooling can be sintered with the microwave board and epoxy board using reflow soldering or a hot plate. Precise positioning of the microwave board and epoxy board ensures reliable sintering, effectively improving production efficiency and yield.

[0049] Example 1

[0050] By the attached Figure 6 It can be seen that each independent component can be used directly after assembly. The specific usage method is as follows:

[0051] ① Place the epoxy board into the sintering base; ② Place the microwave board limiting pressure block into the microwave board, insert the suction head, and complete the positioning constraint of the microwave board by the microwave board limiting pressure block on the microwave board; ③ Apply solder to the welding surface of the microwave board; ④ Place the microwave board limiting pressure block into the sintering base, and buckle the connecting rod into the load connecting rod groove, pull out the magnetic suction head, and complete the sintering assembly of the microwave board and the epoxy board; ⑤ Complete the high-temperature welding of the microwave board and the epoxy board.

Claims

1. A negative pressure positioning sintering tool for microwave plate and epoxy plate, characterized by Its structure includes an epoxy plate sintered base, a microwave plate limiting pressure block, a magnetic suction head and a vacuum device, wherein the epoxy plate sintered base includes a sintered base, a tension spring, and two connecting rods. Screws are provided at the four corners of the sintered base, and screws are provided at both ends of the connecting rod. The tension springs at both ends of the connecting rod are assembled with screws and assembled with the two sides of the sintered base respectively; the microwave plate limiting pressure block includes a limiting pressure block, a limiting pressure block samarium cobalt magnetic ring, and a load rod. An assembly hole is opened on one side of the limiting pressure block, and threaded holes are provided on the adjacent two sides. The load rods are fixed with screws respectively. A limiting pressure block samarium cobalt magnetic ring is installed inside the limiting pressure block. The limiting pressure block samarium cobalt magnetic ring is concentric with the assembly hole, and the bottom plate of the sintered pressure block is provided with a hollow structure; the magnetic suction head includes a suction head, a sealing ring, a magnetic suction head samarium cobalt magnetic ring. The suction head is a flange structure, and a sealing ring and a magnetic suction head samarium cobalt magnetic ring are provided on the flange surface. The other end is connected to the vacuum device; When in use, from top to bottom are the microwave plate limiting pressure block, microwave plate, epoxy plate, and epoxy plate sintered base. The magnetic suction head is inserted into the assembly hole of the limiting pressure block. The samarium cobalt magnetic ring of the limiting pressure block and the samarium cobalt magnetic ring of the magnetic suction head are matched and tightened. The limiting pressure block generates negative pressure constraint on the microwave plate through the vacuum device. The connecting rod in the epoxy plate sintered base is buckled on the load rod of the microwave plate limiting pressure block to fix the tooling as a whole.

2. A negative pressure positioning sintering tool for microwave board and epoxy board according to claim 1, characterized in that the tool The magnetic joint is removed after the whole is fixed, and the magnetic joint does not participate in the high-temperature sintering.

3. The negative pressure positioning sintering fixture for microwave board and epoxy board according to claim 1 is characterized in that The limiting pressure block is a cavity structure with supporting reinforcement ribs inside and holes opened on the sides of the supporting reinforcement ribs to ensure that each cavity is connected.

4. The negative pressure positioning sintering fixture for microwave board and epoxy board according to claim 1 is characterized in that Arc-shaped grooves are provided at both ends of the load rod. During assembly, the connecting rod is buckled into the grooves of the load rod to fix the connection.

5. The negative pressure positioning sintering tool for microwave board and epoxy board according to claim 1 is characterized in that The restraining surface of the limiting pressing block is processed with a groove according to the shape of the microwave board, and the depth of the groove is 1 / 2 of the thickness of the microwave board.

6. The negative pressure positioning sintering fixture for microwave board and epoxy board according to claim 1 is characterized in that The constraint surface of the sintered base is processed into a limiting cavity according to the shape of the epoxy plate, and the limiting cavity of the sintered base and the epoxy plate are clearance-matched.

7. The negative pressure positioning sintering fixture for microwave board and epoxy board according to claim 1 is characterized by: The outer diameter of the suction head matches the diameter of the assembly hole.

8. The negative pressure positioning sintering fixture for microwave board and epoxy board according to claim 6 is characterized by: The hollow structure is a 0.5-2 mm hole opened in the limiting cavity and penetrates the cavity of the limiting pressure block, and the hole spacing is 2-10 times the hole diameter.

9. A negative pressure positioning sintering tool for microwave boards and epoxy boards according to any one of claims 1 to 8, characterized in that The method of use includes the following steps: (1) Place the epoxy plate into the sintering base; (2) The microwave board is placed under the limiting pressure block, and the magnetic suction head is inserted. The other end of the magnetic suction head is connected to the vacuum device to complete the positioning constraint of the microwave board by the limiting pressure block of the microwave board; (3) Coating solder on the welding surface of microwave board; (4) Place the microwave plate limiting block into the epoxy plate sintering base, buckle the connecting rod into the load connecting rod, remove the magnetic suction head, and complete the sintering assembly of the microwave plate and the epoxy plate; (5) Complete the high-temperature welding of the microwave board and the epoxy board.

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