A brazing tool for the grounding lead of a cavity-type metal shell

Abstract

A brazing tooling for the grounding lead of a cavity-type metal shell, comprising a graphite base and graphite positioning posts. The cross-sectional shape of the graphite base is adapted to the inner cavity of the cavity-type metal shell, and its upper end surface has blind holes for accommodating non-grounding leads, and the blind holes correspond one by one to the non-grounding leads that have been glass-sealed on the bottom surface of the cavity-type metal shell; the cavity-type metal shell is sleeved on the upper end of the graphite base through its open end, and the lower ends of the non-grounding leads are inserted into the blind holes; the grounding lead is inserted into the grounding lead hole on the bottom surface of the cavity-type metal shell and abuts against the upper end surface of the graphite base; a lead positioning hole is provided in the center of the graphite positioning post, and a circular groove is provided in the center of the lower end surface, and the circular groove communicates with the lead positioning hole; the graphite positioning post is directly sleeved on the non-grounding lead, and the graphite positioning post is sleeved on the grounding lead after the annular solder is sleeved, and the annular solder is located in the circular groove. The present invention aims to overcome the deficiencies of the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic product packaging, and particularly relates to a brazing tooling for grounding leads of a cavity-type metal shell. Background Art

[0002] In the fields of electronic devices that require high reliability, such as aviation, aerospace, navigation, electronic communication, and weapon radars, the lead welding process is often used for the packaging of the electronic product shells. During brazing, it is required that one end of most grounding leads is inside the cavity and does not allow the lead to protrude. The existing welding methods and toolings cannot effectively solve the problem that the grounding leads in the inner cavity of the product protrude after welding, resulting in unqualified product welding. Therefore, a special welding tooling needs to be used for positioning and welding. Summary of the Invention

[0003] The present invention provides a brazing tooling for grounding leads of a cavity-type metal shell to overcome the deficiencies of the prior art.

[0004] The technical solution adopted by the present invention is as follows: A brazing tooling for grounding leads of a cavity-type metal shell includes a graphite base and a graphite positioning post. The cross-sectional shape of the graphite base is adapted to the inner cavity of the cavity-type metal shell, and its upper end surface has blind holes for accommodating non-grounding leads, and the blind holes correspond one by one to the non-grounding leads that have been glass-sealed on the bottom surface of the cavity-type metal shell; the cavity-type metal shell is sleeved on the upper end of the graphite base through its open end, and the lower end of the non-grounding lead is inserted into the blind hole; the grounding lead is inserted into the grounding lead hole on the bottom surface of the cavity-type metal shell and abuts against the upper end surface of the graphite base; a lead positioning hole is provided in the center of the graphite positioning post, and a circular groove is provided in the center of the lower end surface, and the circular groove communicates with the lead positioning hole; the graphite positioning post is directly sleeved on the non-grounding lead, and the graphite positioning post is sleeved on the grounding lead after a ring-shaped solder is sleeved, and the ring-shaped solder is located in the circular groove.

[0005] The inner diameter of the circular groove is larger than the outer diameter of the ring-shaped solder.

[0006] The inner diameter of the blind hole is slightly larger than the outer diameter of the non-grounding lead, and the inner diameter of the lead positioning hole is slightly larger than the outer diameters of the non-grounding lead and the grounding lead.

[0007] The top end of the blind hole has a first flared opening; the lower port of the lead positioning hole is connected to the circular groove through a second flared opening.

[0008] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0009] 1. The present invention ensures that the lower end of the grounding lead is flush with the lower end surface of the metal shell by using the graphite base and the graphite positioning post in cooperation, avoiding unqualified product welding caused by the protrusion of the grounding lead in the inner cavity of the product.

[0010] 2. The present invention ensures that all leads are not skewed after welding by sleeving graphite positioning posts on all leads.

[0011] 2. The present invention provides a space for accommodating solder at the lower end of the graphite positioning post, and the solder is evenly distributed around the lead, ensuring that the solder melts sufficiently, improving the welding quality and the yield rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is the explosion schematic diagram of the present invention;

[0013] Figure 2 is the structural sectional view schematic diagram of the present invention;

[0014] Figure 3 is the structural sectional view schematic diagram of the graphite positioning post of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0015] The following will Figures 1-3 be described in detail in conjunction with the attached

[0016] drawings and specific embodiments of the present invention.

[0017] To ensure that the solder melts sufficiently, the inner diameter of the circular groove 2-2 is larger than the outer diameter of the annular solder 6, and heat is stored through the circular groove 2-2, which is beneficial to the melting of the solder.

[0018] In order to solve the problem of different thermal displacements caused by different coefficients of thermal expansion between the metal housing and the graphite during the sintering process, resulting in the deformation of the leads. The inner diameter of the blind hole 1-1 is slightly larger than the outer diameter of the non-grounded lead 4, and the inner diameter of the lead positioning hole 2-1 is slightly larger than the outer diameters of the non-grounded lead 4 and the grounded lead 5. This allows the non-grounded lead 4 and the grounded lead 5 to have a certain displacement amount, avoiding the deformation of the leads due to different thermal displacements during the brazing process.

[0019] For the convenience of installation, the top of the blind hole 1-1 has a first flared opening 1-2; the lower port of the lead positioning hole 2-1 is connected to the circular groove 2-2 through a second flared opening 2-3. Through the guiding action of the flared opening, the rapid installation of the tooling is achieved.

[0020] The above embodiments are only the preferred embodiments of the present invention and are not used to limit the scope of implementation of the present invention. Therefore, all equivalent changes made to the content described in the claims of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A brazing tooling for the grounding lead of a cavity-type metal housing, characterized in that: It includes a graphite base (1) and graphite positioning posts (2). The cross-sectional shape of the graphite base (1) is adapted to the inner cavity of the cavity-type metal shell (3), and its upper end face has blind holes (1-1) for accommodating non-grounded leads (4), and the blind holes (1-1) correspond one by one to the non-grounded leads (4) that have been glass-sealed on the bottom surface of the cavity-type metal shell (3); the cavity-type metal shell (3) is sleeved on the upper end of the graphite base (1) through its open end, and the lower ends of the non-grounded leads (4) are inserted into the blind holes (1-1); the grounded lead (5) is inserted into the grounded lead hole on the bottom surface of the cavity-type metal shell (3) and abuts against the upper end face of the graphite base (1); a lead positioning hole (2-1) is provided in the center of the graphite positioning post (2), and a circular groove (2-2) is provided in the center of the lower end face, and the circular groove (2-2) communicates with the lead positioning hole (2-1); the graphite positioning post (2) is directly sleeved on the non-grounded lead (4), and the graphite positioning post (2) is sleeved on the grounded lead (5) after a ring-shaped solder (6) is sleeved on it, and the ring-shaped solder (6) is located in the circular groove (2-2).

2. The brazing tooling for the grounding lead of a cavity-type metal housing according to claim 1, characterized in that: The inner diameter of the circular groove (2-2) is larger than the outer diameter of the ring-shaped solder (6).

3. The brazing tooling for the grounding lead of a cavity-type metal housing according to claim 1 or 2, characterized in that: The inner diameter of the blind hole (1-1) is slightly larger than the outer diameter of the non-grounded lead (4), and the inner diameter of the lead positioning hole (2-1) is slightly larger than the outer diameters of the non-grounded lead (4) and the grounded lead (5).

4. The brazing tooling for the grounding lead of a cavity-type metal housing according to claim 3, characterized in that: The top end of the blind hole (1-1) has a first flared opening (1-2); the lower port of the lead positioning hole (2-1) is connected to the circular groove (2-2) through a second flared opening (2-3).

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