Thermocompression welding head

Abstract

The utility model provides a thermocompression welding head which is used for connecting two electrodes and is provided with an electrode tip and a thermocompression block. The electrode tip is provided with two electrode plates, a joint part, a fixing block and a hot pressing part. The two electrode plates are arranged at intervals and can be connected with the two electrodes respectively. The joint part is connected with the two electrode plates, and the fixing block is arranged between the two electrode plates. The hot pressing part is connected to the joint part and is provided with a clamping groove. The clamping groove is formed on one side of the hot-pressing part away from the joint part. The hot-pressing block can be combined with the inner surface of the clamping groove, and the thermal expansion coefficient of the hot-pressing block is lower than that of the electrode tip. Therefore, the end part of the thermocompression welding head is prevented from bending and deforming due to thermal expansion, and the welding of the circuit board to be welded is not influenced.

Description

Technical Field

[0001] The utility model relates to a hot pressing machine tool, in particular to a hot pressing welding head. Background Art

[0002] With the development of the electronics industry, flexible printed circuits (FPCs) and printed circuit boards (PCBs) are increasingly used for circuit connections, driven by the need for lighter and smaller electronic products. However, due to the numerous pins required for circuit connection, automated soldering and hot presses are now increasingly used to avoid the positioning inaccuracies associated with traditional manual soldering, ensuring both automation and product yield.

[0003] During the hot press welding process, the hot press's welding head is connected to two electrodes and pressed against the circuit board to be welded. An electric current is then applied. The current flowing through the circuit board and the end of the welding head creates thermal resistance, heating the circuit board to a molten state and bonding the metals.

[0004] However, since the welding head is made of a material with a high thermal expansion coefficient, and specifically the end of the welding head is a long strip, when the welding head is heated by resistance, the end of the long strip of the welding head will bend and bulge due to thermal expansion, making it impossible for the two sides of the end of the long strip of the welding head to contact the circuit board to be welded, thereby affecting the welding of the circuit board.

[0005] In view of this, proposing a better improvement solution is an urgent problem to be solved in this industry. Utility Model Content

[0006] The main purpose of the present utility model is to propose a hot pressing welding head, which aims to solve the problem that when the welding head is heated by resistance, the end of the welding head will bend and deform due to thermal expansion, so that the two sides of the end of the welding head cannot contact the circuit board to be welded, thereby affecting the welding of the circuit board.

[0007] To achieve the above objectives, the present invention provides a hot pressing welding head for connecting two electrodes, and has:

[0008] An electrode head having:

[0009] Two electrode plates are spaced apart and can be connected to the two electrodes respectively;

[0010] a joint portion connecting the two electrode plates;

[0011] a heat dissipation channel in a slotted shape formed between the two electrode plates and the joint;

[0012] a fixed block disposed between the two electrode plates;

[0013] a hot pressing portion connected to the joint portion and having:

[0014] a locking groove formed on a side of the hot pressing portion away from the joining portion;

[0015] A heat pressing block can be combined with the inner surface of the clamping groove, and the heat expansion coefficient of the heat pressing block is lower than the heat expansion coefficient of the electrode head, and the hardness of the heat pressing block is harder than the hardness of the electrode head.

[0016] The hot pressing welding head as described above, wherein the hot pressing block has:

[0017] a locking portion disposed in the locking groove and coupled to an inner surface of the locking groove;

[0018] A protrusion protrudes from the locking portion toward a direction away from the engaging portion and protrudes outside the locking groove, and the width of the protrusion is smaller than that of the locking portion.

[0019] As mentioned above, the hot pressing welding head, wherein the hot pressing part has:

[0020] Two protruding pieces extending in a direction away from the engaging portion, the two protruding pieces being spaced apart;

[0021] Two extension pieces are respectively connected to one of the protruding pieces, and each extension piece extends from the protruding piece toward the other protruding piece; thereby, the two protruding pieces and the two extension pieces can form the engaging groove and surround the engaging portion.

[0022] As the aforementioned hot pressing welding head, wherein,

[0023] The hot pressing portion has a plurality of first through holes which penetrate two opposite sides of the hot pressing portion;

[0024] The hot pressing block has a plurality of second through holes, the number and position of which correspond to the first through holes and pass through the engaging portion;

[0025] The hot pressing welding head has a plurality of fixing parts, the number and position of which correspond to the first through holes, and each of the fixing parts can be inserted into one of the first through holes and one of the second through holes.

[0026] As described above, in the thermocompression welding head, each of the electrode plates has a recessed portion formed on a side of the electrode plate facing the heat dissipation channel, and the fixing block can be coupled to an inner surface of the recessed portion.

[0027] As mentioned above, the hot pressing welding head, wherein the material of the hot pressing block can be molybdenum alloy, tungsten alloy or stainless steel.

[0028] The present invention replaces the end of the hot press welding head with a hot press block made of a material with a lower thermal expansion coefficient and a higher hardness. This prevents the end of the hot press welding head from bending and deforming due to thermal expansion, which could affect the soldering of the circuit board being welded. Furthermore, to increase the heating rate of the hot press block, the hot press section is also formed with a snap-fit ​​groove. The hot press block can be attached to the inner surface of the snap-fit ​​groove, thereby increasing the heat conduction efficiency of the hot press section.

[0029] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, but they are not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A perspective view of the first embodiment of the present utility model;

[0031] Figure 2 This is an exploded view of the first embodiment of the present utility model;

[0032] Figure 3 This is a cross-sectional view of the first embodiment of the present utility model;

[0033] Figure 4 A perspective view of a second embodiment of the present invention;

[0034] Figure 5 This is an exploded view of the second embodiment of the present utility model;

[0035] Figure 6 This is a cross-sectional view of the second embodiment of the present invention. DETAILED DESCRIPTION

[0036] Please refer to Figure 1 and Figure 4 The present invention provides a hot pressing welding head for connecting two electrodes, and comprises an electrode head 10 and a hot pressing block 20 , and can optionally have a plurality of fixing members 30 .

[0037] Please refer to Figure 2 . The electrode head 10 has two electrode plates 11, a joint 12, a heat dissipation channel 13, a fixed block 14, and a hot pressing portion 15. The two electrode plates 11 are arranged at intervals and can connect two electrodes respectively. Each electrode plate 11 has a recessed portion 111, which is formed on one side of the electrode plate 11 close to the other electrode plate 11. The joint 12 connects the two electrode plates 11. The heat dissipation channel 13 is slotted and formed between the two electrode plates 11 and the joint 12. The fixed block 14 is arranged in the middle of the two electrode plates 11. In the first and second embodiments, the fixed block 14 is combined with the inner surface of the recessed portion 111 of the two electrode plates 11 and extends toward the joint 12. In other embodiments, the fixed block 14 may also be arranged only in the recessed portion 111.

[0038] Please refer to Figure 2 and Figure 3 . In the first embodiment, the hot pressing portion 15 is connected to the joint portion 12 and has a snap-fit ​​groove 151, two protruding pieces 152, and two extending pieces 153. The snap-fit ​​groove 151 is formed on a side of the hot pressing portion 15 away from the joint portion 12. The two protruding pieces 152 are spaced apart from each other and extend in a direction away from the joint portion 12. The two extending pieces 153 are respectively connected to one of the protruding pieces 152, and each extending piece 153 extends from the protruding piece 152 toward the other protruding piece 152. In this way, the two protruding pieces 152 and the two extending pieces 153 can surround and form the snap-fit ​​groove 151.

[0039] The heat block 20 is capable of being bonded to the inner surface of the engagement groove 151, and its coefficient of thermal expansion is lower than that of the electrode head 10. Consequently, when the user heats the heat block 20 and presses it against the circuit board to be soldered, the heat block 20 does not bend or deform due to thermal expansion, thereby affecting the soldering of the circuit board. The heat block 20 can be made of a metal that absorbs and dissipates heat quickly and has a low coefficient of thermal expansion, such as a molybdenum alloy, a tungsten alloy, or stainless steel.

[0040] In the first embodiment, the hot pressing block 20 has a locking portion 21 and a protruding portion 22. The locking portion 21 is disposed in the locking groove 151 and is coupled to the inner surface of the locking groove 151. Specifically, the locking portion 21 is coupled to two protruding pieces 152 and two extending pieces 153. The protruding portion 22 protrudes from the locking portion 21 in a direction away from the joint 12 and protrudes out of the locking groove 151. Specifically, the protruding portion 22 protrudes from the locking groove 151 from the gap between the two extending pieces 153. The width of the protruding portion 22 is smaller than that of the locking portion 21. Therefore, the locking portion 21 can be locked in the locking groove 151 and will not be separated from the gap between the two extending pieces 153. In this way, the hot pressing block 20 can be engaged with the hot pressing portion 15.

[0041] Please refer to Figure 5 and Figure 6 The technical features of the second embodiment of the present invention are similar to those of the first embodiment, with the only difference being that in the second embodiment, the hot pressing portion 15 does not have two extension pieces 153 but has a plurality of first through holes 154 , and the hot pressing block 20 further has a plurality of second through holes 23 , and the present invention further has a plurality of fixing pieces 30 .

[0042] In the second embodiment, the first through-holes 154 extend through two opposing surfaces of the hot-pressing unit 15. Specifically, the first through-holes 154 extend through the two protruding members 152 of the hot-pressing unit 15. The number and position of the second through-holes 23 correspond to the number and position of the first through-holes 154, and the second through-holes 23 extend through the engaging portion 21 of the hot-pressing block 20. The number and position of the fixing members 30 correspond to the number and position of the first through-holes 154. When the hot-pressing block 20 is mounted on the hot-pressing unit 15, each fixing member 30 can be inserted into one of the first through-holes 154 and one of the second through-holes 23. This secures the hot-pressing block 20 to the hot-pressing unit 15.

[0043] In the first and second embodiments, when using the present invention, the hot pressing block 20 must first be fixed to the hot pressing portion 15 by means of a snap or locking fastener 30. Then, the hot pressing head is heated using an electrode. The temperature of the joint portion 12 of the electrode head 10 and the hot pressing portion 15 rises due to the short circuit, and the temperature is transferred to the hot pressing block 20. At this time, because the thermal expansion coefficient of the hot pressing block 20 is relatively low, even if the temperature rises, the hot pressing block 20 will not deform or bend. Finally, the heated hot pressing block 20 is pressed against the circuit board to be welded, heating the circuit board to a molten state and allowing the metals to bond.

[0044] The advantage of this invention lies in replacing the end of the hot pressing head with a hot pressing block 20 made of a material with a lower coefficient of thermal expansion and a higher hardness. This prevents the end of the hot pressing head from bending and deforming due to thermal expansion, which could affect the soldering of the circuit board. Furthermore, to increase the heating rate of the hot pressing block 20, the hot pressing portion 15 is also formed with a snap-fit ​​groove 151. The hot pressing block 20 can be coupled to the inner surface of the snap-fit ​​groove 151, thereby increasing the heat conduction efficiency of the hot pressing portion 15.

[0045] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, technicians familiar with the field may make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims of the present invention.

Claims

1. A hot pressing welding head for connecting two electrodes, characterized in that: And have: An electrode head having: Two electrode plates are spaced apart and can be connected to the two electrodes respectively; a joint portion connecting the two electrode plates; a heat dissipation channel in a slotted shape formed between the two electrode plates and the joint; a fixed block disposed between the two electrode plates; a hot pressing portion connected to the joint portion and having: a locking groove formed on a side of the hot pressing portion away from the joining portion; A heat pressing block can be combined with the inner surface of the clamping groove, and the heat expansion coefficient of the heat pressing block is lower than the heat expansion coefficient of the electrode head, and the hardness of the heat pressing block is harder than the hardness of the electrode head.

2. The hot pressing welding head according to claim 1, characterized in that: The hot pressing block has: a locking portion disposed in the locking groove and coupled to an inner surface of the locking groove; A protrusion protrudes from the locking portion toward a direction away from the engaging portion and protrudes outside the locking groove, and the width of the protrusion is smaller than that of the locking portion.

3. The hot pressing welding head according to claim 2, characterized in that: The hot pressing unit has: Two protruding pieces extending in a direction away from the engaging portion, the two protruding pieces being spaced apart; Two extension pieces are respectively connected to one of the protruding pieces, and each extension piece extends from the protruding piece toward the other protruding piece; thereby, the two protruding pieces and the two extension pieces can form the engaging groove and surround the engaging portion.

4. The hot pressing welding head according to claim 2, characterized in that: The hot pressing portion has a plurality of first through holes which penetrate two opposite sides of the hot pressing portion; The hot pressing block has a plurality of second through holes, the number and position of which correspond to the plurality of first through holes and pass through the engaging portion; The hot pressing welding head has a plurality of fixing parts, the number and position of which correspond to the plurality of first through holes, and each of the fixing parts can be inserted into one of the first through holes and one of the second through holes.

5. The hot pressing welding head according to any one of claims 1 to 4, characterized in that: Each of the electrode plates has a recessed portion formed on a side of the electrode plate facing the heat dissipation channel, and the fixing block can be combined with the inner surface of the recessed portion.

6. The hot pressing welding head according to any one of claims 1 to 4, characterized in that: The hot pressing block is made of molybdenum alloy, tungsten alloy or stainless steel.

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