Brazing clamp for needle grid array of ceramic tube shell

Abstract

The utility model relates to the technical field of brazing auxiliary devices, and discloses a brazing clamp for a needle grid array of a ceramic tube shell, which comprises a fixed graphite plate, a bolt and a contact pin, and a contact pin, a first movable graphite plate, a second movable graphite plate, a graphite substrate and a graphite side plate are sequentially arranged and mounted on the bottom wall in the mounting groove at intervals. When the graphite plate is mounted and used, a worker inserts the bolts into the corresponding mounting holes of the fixed graphite plate, the fixed graphite plate is obliquely placed, the contact pins are placed into the notches of the semicircular pin grooves of the fixed graphite plate, and then the bolts sequentially penetrate into other graphite plates; during assembly, the graphite plates are moved to enable the inserting needles to be clamped between notches of the semicircular needle grooves of the two adjacent graphite plates, then processed flat welding flux is lightly placed in the grooves formed in the graphite plates, then the ceramic base is placed on the welding flux, and finally the nuts are screwed to fix the brazing clamp, so that assembly of the brazing welding frame is completed.

Description

Technical Field

[0001] The utility model relates to the technical field of brazing auxiliary devices, in particular to a brazing fixture for a pin grid array of a ceramic tube shell. Background Art

[0002] Pin grid array (PGA) packaging technology is a branch of microelectronics packaging technology. PGA packaging generally packages integrated circuits (ICs) in ceramic tiles. The bottom surface of the tile is arranged in a square array of pins. These pins can be inserted or soldered into the corresponding sockets on the circuit board. It is very suitable for applications that require frequent plugging and unplugging.

[0003] The commonly used graphite fixture for pin-grid array brazing involves punching circular holes in a rectangular graphite plate, each slightly larger than the diameter of the pins. Pins are then inserted into each hole, followed by solder and the ceramic shell, and brazing begins. This structure has the disadvantage of not guaranteeing pin verticality and positioning accuracy. If the holes are too large, the pins are easy to insert during installation, but they will tilt inside, making verticality impossible. If the holes are too small, the pins' tilt is reduced, but installation becomes difficult.

[0004] Brazing metallized ceramic parts to metal components is also called sealing, to distinguish it from brazing metal parts. Because ceramics and metals generally have different coefficients of expansion and thermal conductivity, significant stress is generated during the sealing process. Furthermore, ceramics are brittle, so improper or non-standard sealing can lead to failure. For flat and end-face seals, preparation involves using a mounting mold with centering and pressurizing dies. Traditional graphite fixtures are simple to assemble using a single-piece graphite plate. However, if they are not placed securely in the brazing furnace after assembly, the metal and ceramic components may become misaligned, compromising brazing accuracy.

[0005] Therefore, the brazing fixture for the pin grid array of a ceramic tube shell proposed in the present invention can simplify assembly, reduce the mounting time during brazing, improve brazing efficiency, and also ensure the verticality and position accuracy of the needles, thereby improving brazing accuracy and yield. Utility Model Content

[0006] In order to solve the technical problem that the traditional graphite fixture is an integrated graphite plate, which is simple to assemble but if it is not placed stably when entering the brazing furnace after assembly, the metal parts and the ceramic parts will be misaligned, which reduces the brazing accuracy and cannot ensure the verticality and position accuracy of the needle, the utility model provides a brazing fixture for a pin grid array of a ceramic tube shell.

[0007] The utility model adopts the following technical solution: a brazing fixture for a pin grid array of a ceramic tube shell, comprising a fixed graphite plate, bolts and pins, wherein a mounting groove is provided on the top of the fixed graphite plate, and the pins, a first movable graphite plate, a second movable graphite plate, a graphite base plate and a graphite side plate are sequentially arranged and spaced on the bottom wall of the mounting groove;

[0008] Two groups of sink grooves are distributed on the top of the fixed graphite plate, and the sink grooves are located on one side of the installation groove. The side wall of the groove cavity of the installation groove is distributed with multiple groups of semicircular needle grooves;

[0009] The first movable graphite plate, the second movable graphite plate, the graphite base plate and the graphite side plate have multiple groups of semicircular needle grooves on their side walls, and the tops of the first movable graphite plate and the second movable graphite plate have two groups of square grooves.

[0010] Four groups of sinking grooves are symmetrically distributed on the top of the graphite base plate, and two groups of sinking grooves are distributed on the top of the graphite side plate.

[0011] Preferably, two groups of mounting holes are distributed and opened through the side walls of the fixed graphite plate, the first movable graphite plate, the second movable graphite plate, the graphite base plate and the graphite side plate.

[0012] Preferably, the fixed graphite plate, the first movable graphite plate, the second movable graphite plate, the graphite base plate and the multiple groups of semicircular pin grooves on the graphite side plate are connected and combined to form circular pinholes, and the pins are distributed at intervals in the multiple groups of circular pinholes.

[0013] Preferably, the two groups of bolts are distributed in sequence and pass through the mounting holes on the fixed graphite plate, the first movable graphite plate, the second movable graphite plate, the graphite base plate and the graphite side plate. One end of the bolt is threaded, and one end of the bolt is connected to a nut through a thread.

[0014] Preferably, the multiple groups of sink grooves on the fixed graphite plate, the graphite base plate and the graphite side plate are combined with the multiple groups of square grooves on the first movable graphite plate and the second movable graphite plate to form multiple groups of limiting grooves.

[0015] Preferably, solder is installed in the limiting groove, and a ceramic base is installed on the top of the solder.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] When the pin grid array brazing fixture of the ceramic tube shell of the present invention is installed and used, the staff first inserts the bolts into the mounting holes corresponding to the fixed graphite plates, tilts the fixed graphite plates, puts the pins into the notches of the semicircular pin grooves of the fixed graphite plates, and then sequentially inserts the bolts into other graphite plates, and moves the graphite plates so that the pins are clamped between the notches of the semicircular pin grooves of two adjacent graphite plates, ensuring the verticality and position accuracy of the pins, improving the brazing accuracy and yield rate, and combining the sunken grooves and square grooves opened on the graphite plates to form four groups of placement grooves. Subsequently, the processed flat solder is gently placed in the placement grooves on the graphite plates, and then the ceramic base is placed on the solder. Finally, the nuts are tightened to fix the brazing fixture. Thus, the brazing fixture is assembled and can be put into use. The assembly process is simple and fast, and the brazing efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the overall explosion structure provided by the utility model;

[0019] Figure 2 This is a schematic diagram of the fixed graphite plate structure of the utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the movable graphite plate of the utility model;

[0021] Figure 4 This is a schematic diagram of the structure of the graphite substrate and graphite side plate of the utility model;

[0022] Figure 5 A schematic diagram of the ceramic base structure provided by the utility model;

[0023] Figure 6 This is a schematic diagram of the pin structure of the utility model;

[0024] Figure 7 This is a schematic diagram of the solder structure of the present utility model;

[0025] Figure 8 It is a schematic diagram of the overall assembly structure of the utility model.

[0026] In the figure: 1. Fixed graphite plate; 2. First movable graphite plate; 3. Second movable graphite plate; 4. Graphite base plate; 5. Graphite side plate; 6. Sink; 7. Square groove; 8. Semicircular pin groove; 9. Mounting hole; 10. Mounting groove; 11. Bolt; 12. Nut; 13. Pin; 14. Solder; 15. Ceramic base. DETAILED DESCRIPTION

[0027] Below, the present invention is further described in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0028] See also Figure 1 - Figure 8 The present embodiment provides a brazing fixture for a pin grid array of a ceramic tube shell, comprising a fixed graphite plate 1, bolts 11, and pins 13. A mounting groove 10 is defined on the top of the fixed graphite plate 1. The pins 13, a first movable graphite plate 2, a second movable graphite plate 3, a graphite base plate 4, and a graphite side plate 5 are sequentially arranged and spaced apart on the bottom wall of the mounting groove 10. Two sets of sink grooves 6 are defined on the top of the fixed graphite plate 1, and the sink grooves 6 are located on one side of the mounting groove 10. Multiple sets of semicircular pin grooves 8 are defined on the sidewalls of the mounting groove 10.

[0029] Furthermore, multiple groups of semicircular needle grooves 8 are distributed on the side walls of the first movable graphite plate 2, the second movable graphite plate 3, the graphite base plate 4 and the graphite side plate 5. Two groups of square grooves 7 are distributed on the top of the first movable graphite plate 2 and the second movable graphite plate 3. Four groups of sink grooves 6 are symmetrically distributed on the top of the graphite base plate 4, and two groups of sink grooves 6 are distributed on the top of the graphite side plate 5.

[0030] Furthermore, two groups of mounting holes 9 are distributed through the side walls of the fixed graphite plate 1, the first movable graphite plate 2, the second movable graphite plate 3, the graphite base plate 4 and the graphite side plate 5. Multiple groups of semicircular pin grooves 8 on the fixed graphite plate 1, the first movable graphite plate 2, the second movable graphite plate 3, the graphite base plate 4 and the graphite side plate 5 are connected and combined to form circular pinholes, and the pins 13 are distributed at intervals and located in the multiple groups of circular pinholes;

[0031] Furthermore, two groups of bolts 11 are sequentially distributed and penetrate the mounting holes 9 on the fixed graphite plate 1, the first movable graphite plate 2, the second movable graphite plate 3, the graphite base plate 4 and the graphite side plate 5. One end of the bolt 11 is threaded, and one end of the bolt 11 is connected to a nut 12 through a thread.

[0032] Furthermore, multiple groups of sink grooves 6 on the fixed graphite plate 1, the graphite base plate 4, and the graphite side plate 5 are combined with multiple groups of square grooves 7 on the first movable graphite plate 2 and the second movable graphite plate 3 to form multiple groups of limiting grooves, in which solder 14 is installed, and a ceramic base 15 is installed on the top of the solder 14.

[0033] Specifically, a brazing fixture for a pin grid array of a ceramic tube shell in an embodiment of the present application is composed of a fixed graphite plate 1, eight first movable graphite plates 2, six second movable graphite plates 3, a graphite base plate 4, a graphite side plate 5, two bolts 11 and two nuts 12. When it needs to be assembled for use, the staff first uses an air pressure gun to wash away the residual graphite powder on the graphite fixture, and places the graphite fixture on a smooth and flat operating table. The ceramic base 15, solder 14 and pins 13 are prepared in advance, and then the bolts 11 are inserted into the corresponding mounting holes 9 on the fixed graphite plate 1. The fixed graphite plate 1 is then tilted and the pins 13 are placed into the notches of the semicircular pin grooves 8 on the fixed graphite plate 1. Then, a first movable graphite plate 2 is inserted into the bolt 11, and the first movable graphite plate 2 is moved so that the pins 13 are clamped between the notches of the semicircular pin grooves 8 on the fixed graphite plate 1 and the notches of the semicircular pin grooves 8 on the first movable graphite plate 2.

[0034] Then, according to the above operation method, the remaining 1 first movable graphite plate 2, 3 second movable graphite plates 3, 2 first movable graphite plates 2, 1 graphite base plate 4, 2 first movable graphite plates 2, 3 second movable graphite plates 3, 2 first movable graphite plates 2 and 1 graphite side plate 5 are sequentially inserted through the bolt 11. For each inserted graphite plate, a corresponding number of pins 13 is inserted corresponding to the number of semicircular pin grooves 8 provided on the plate. The pins 13 are tightly located between the graphite plates, which can ensure the verticality and position accuracy of the pins 13, thereby improving the brazing accuracy and yield rate.

[0035] The sink grooves 6 and the square grooves 7 opened on the graphite plate are combined and spliced ​​into four groups of placement grooves. Then the processed flat solder 14 is gently placed in the placement grooves on the graphite plate, and then the ceramic base 15 is placed on the solder 14. Finally, the nut 12 is tightened to fix the brazing fixture. Thus, the brazing rack is assembled and can be put into use. The assembly process is simple and fast, which improves the brazing efficiency.

[0036] Working principle: When the pin grid array brazing fixture of the ceramic tube shell is installed and used, the staff first inserts the bolt 11 into the mounting hole 9 corresponding to the fixed graphite plate 1, tilts the fixed graphite plate 1, and places the pin 13 into the notch of the semicircular pin groove 8 of the fixed graphite plate 1. Then, the bolt 11 is inserted into other graphite plates in sequence, and the graphite plates are moved so that the pin is clamped between the notches of the semicircular pin groove 8 of two adjacent graphite plates to ensure the verticality and position accuracy of the pin 13, improve the brazing accuracy and yield rate, and the sinking groove 6 and the square groove 7 opened on the graphite plate are combined and spliced ​​into four groups of placement grooves. Then, the processed flat solder 14 is gently placed in the placement groove on the graphite plate, and then the ceramic base 15 is placed on the solder 14. Finally, the nut 12 is tightened to fix the brazing fixture. Thus, the brazing fixture is assembled and can be put into use. The assembly process is simple and fast, and the brazing efficiency is improved.

[0037] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. In this embodiment, the number of needles is 32 and the array of the product is 2X2. Other embodiments, such as increasing or decreasing the number of needles and expanding the size of the graphite fixture to increase the number of arrays, all fall within the scope of protection of the present invention patent. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. A brazing fixture for a pin grid array of a ceramic tube shell, comprising a fixed graphite plate (1), a bolt (11) and a pin (13), characterized in that: The top of the fixed graphite plate (1) is provided with a mounting groove (10), and the bottom wall of the mounting groove (10) is provided with pins (13), a first movable graphite plate (2), a second movable graphite plate (3), a graphite base plate (4) and a graphite side plate (5) arranged in sequence and spaced apart. Two groups of sink grooves (6) are distributed on the top of the fixed graphite plate (1), and the sink grooves (6) are located on one side of the groove edge of the installation groove (10). The groove cavity side wall of the installation groove (10) is distributed with multiple groups of semicircular needle grooves (8); Multiple groups of semicircular needle grooves (8) are distributed on the side walls of the first movable graphite plate (2), the second movable graphite plate (3), the graphite base plate (4) and the graphite side plate (5), and two groups of square grooves (7) are distributed on the tops of the first movable graphite plate (2) and the second movable graphite plate (3); Four groups of sink grooves (6) are symmetrically distributed on the top of the graphite base plate (4), and two groups of sink grooves (6) are distributed on the top of the graphite side plate (5).

2. The brazing fixture for a pin grid array of a ceramic tube shell according to claim 1, characterized in that: Two groups of mounting holes (9) are distributed and opened through the side walls of the fixed graphite plate (1), the first movable graphite plate (2), the second movable graphite plate (3), the graphite base plate (4) and the graphite side plate (5).

3. The brazing fixture for a pin grid array of a ceramic tube shell according to claim 1, characterized in that: The fixed graphite plate (1), the first movable graphite plate (2), the second movable graphite plate (3), the graphite base plate (4) and the multiple groups of semicircular needle grooves (8) on the graphite side plate (5) are connected and combined to form circular pinholes, and the insertion pins (13) are distributed at intervals in the multiple groups of circular pinholes.

4. The brazing fixture for a pin grid array of a ceramic tube shell according to claim 1, characterized in that: The two groups of bolts (11) are sequentially distributed and penetrate the mounting holes (9) on the fixed graphite plate (1), the first movable graphite plate (2), the second movable graphite plate (3), the graphite base plate (4) and the graphite side plate (5); one end of the bolt (11) is provided with a thread, and one end of the bolt (11) is connected to a nut (12) through a thread.

5. The brazing fixture for a pin grid array of a ceramic tube shell according to claim 1, characterized in that: The multiple groups of sink grooves (6) on the fixed graphite plate (1), the graphite base plate (4), and the graphite side plate (5) and the multiple groups of square grooves (7) on the first movable graphite plate (2) and the second movable graphite plate (3) are combined to form multiple groups of limiting grooves.

6. The brazing fixture for a pin grid array of a ceramic tube shell according to claim 5, characterized in that: Solder (14) is installed in the limiting groove, and a ceramic base (15) is installed on the top of the solder (14).

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