Pulse thermocompression welding machine

Abstract

The invention relates to the technical field of pulse thermocompression welding machines, and discloses a pulse thermocompression welding machine which comprises a machine body and a base, the base is arranged on the machine body, a hot melting head used for heating and welding a workpiece is arranged on the machine body, and an air blowing assembly used for blowing air to the hot melting head is arranged on the machine body; and when the hot melting head completes welding of the workpiece, the air blowing assembly blows air to cool the end, close to the workpiece, of the hot melting head, the air blowing assembly can rapidly cool the end of the hot melting head, so that the cooling waiting time after welding is completed is shortened, and the cooling efficiency is improved. The phenomena of wiredrawing, trailing, bridging and the like caused by incomplete solidification of a molten material when the hot melting head is separated from a workpiece are avoided, and the risks of welding spot collapse and chip position offset are reduced and eliminated, so that the forming quality and the positioning precision of a welding interface are improved.

Description

Technical Field

[0001] This application relates to the technical field of pulse hot press welding machines, and in particular to a pulse hot press welding machine. Background Technology

[0002] A pulse hot press welding machine is a welding device specifically designed for precision electronic assembly. It uses a built-in transformer to convert the input voltage into a low-voltage, high-current pulse output, which causes the current to flow instantaneously through a hot melt head with specific resistance characteristics. This allows the hot melt head to rapidly heat up to the set temperature in a very short time, thus achieving localized heating welding.

[0003] In related technologies, a pulse hot press welding machine includes a machine body and a base. The base is set on the machine body and is used to place the workpiece to be welded. The machine body is equipped with a hot melt head for heating and welding the workpiece.

[0004] The hot melt head itself is usually made of a high thermal conductivity metal material, possessing a large heat capacity and thermal inertia. During the welding process, the hot melt head accumulates a high amount of heat energy. Even if the pulse heating stops immediately, the hot melt head will maintain a high temperature for a period of time under natural cooling. This residual heat may cause phenomena such as weld point collapse, position drift, or wire drawing when the hot melt head separates from the welded product, and may even lead to internal damage or deformation of the welded product. Summary of the Invention

[0005] In order to improve the problem that residual heat in the hot melt head after welding can easily cause damage or deformation when separating from the workpiece, this application provides a pulse hot press welding machine.

[0006] This application provides a pulse hot press welding machine, which adopts the following technical solution: A pulse hot press welding machine includes a machine body and a base. The base is disposed on the machine body and is used to place the workpiece to be welded. The machine body is provided with a hot melt head for heating and welding the workpiece, and the machine body is provided with an air blowing component for blowing air onto the hot melt head. When the hot melt head finishes welding the workpiece, the air blowing component blows air onto the end of the hot melt head near the workpiece to cool it down.

[0007] By adopting the above technical solution, an air-blowing component is provided on the machine body for blowing air onto the hot melt head. This allows the air-blowing component to quickly cool the end of the hot melt head, shortening the cooling waiting time after welding. This avoids phenomena such as stringing, tailing, and bridging caused by incomplete solidification of molten material when the hot melt head separates from the workpiece. It also reduces the risk of solder joint collapse and chip position misalignment, thereby improving the forming quality and positioning accuracy of the welding interface. At the same time, by timely blocking the continuous conduction of residual heat from the hot melt head to the workpiece, the heat-affected zone is reduced, preventing thermal deformation, burns, or melting of the workpiece due to local overheating. This reduces residual internal stress caused by mismatch in thermal expansion coefficients, preventing product warping and solder joint micro-cracks, thereby significantly improving the welding reliability and long-term service life of the product.

[0008] Optionally, the hot melt head is provided with a guide groove that extends toward the workpiece, and the airflow blown out by the air blowing assembly can enter the welding point of the workpiece along the guide groove.

[0009] By adopting the above technical solution, the airflow extended towards the workpiece through the guide groove, the airflow blown by the air blowing component can enter the welding point of the workpiece along the guide groove, avoiding the loss of cooling efficiency caused by the airflow diffusing around the hot melt head. This achieves targeted and efficient cooling of the solder joint and heat-affected zone, further suppressing phenomena such as wire drawing, tailing, solder joint collapse, and chip position displacement, thereby improving the welding quality and positional accuracy. At the same time, the cooling airflow can form a local air curtain effect between the hot melt head and the workpiece, which not only accelerates the cooling of the welding area, but also effectively blocks impurities in the external environment from entering the welding interface, and helps to promptly disperse the trace amount of fumes generated during the welding process, maintaining the cleanliness of the welding area.

[0010] Optionally, the hot melt head is equipped with a first motor, the output end of the first motor is connected to the hot melt head, and the first motor is used to drive the hot melt head to rotate; when the hot melt head moves away from the workpiece, the first motor drives the hot melt head to rotate, and the guide groove is separated from the air blowing path of the air blowing assembly.

[0011] By adopting the above technical solution, when the hot melt head completes welding and moves away from the workpiece, the first motor drives the hot melt head to rotate, causing the guide groove to deviate from the air outlet direction of the air blowing assembly. This automatically cuts off the airflow cooling the end of the hot melt head, while preventing the cooling airflow from forming turbulence in a confined space. This would cause the weld joint, which has not yet fully solidified, to be subjected to sudden cooling, resulting in large residual stress and even causing incomplete welding or micro-cracks. The guide groove deviates from the air blowing path in the early stage of the hot melt head's ascent, cutting off the direct impact of the cold airflow on the welding interface. This allows the weld joint to solidify naturally, avoiding stress concentration caused by rapid cooling and ensuring the uniformity of weld crystallization and the connection strength.

[0012] Optionally, the hot melt head is provided with a baffle, which is located on the moving path of the airflow blowing towards the end of the hot melt head, and the baffle is used to block the airflow from entering the welding part of the workpiece.

[0013] By adopting the above technical solution, the baffle is located on the moving path of the airflow towards the end of the hot melt head, so that the baffle can block the high-speed airflow from blowing directly onto the welding area at the moment the hot melt head is withdrawn. This avoids the formation of a rapid cooling effect at the weld point that has not yet fully solidified, and even causes incomplete welding or micro-cracks. By physically blocking the airflow path, the air blowing component can cool the end of the hot melt head while the airflow is blocked outside the welding interface. This ensures the cooling effect of the hot melt head body and avoids the cold airflow from interfering with the solidification process of the weld point, thereby improving the welding quality and reliability.

[0014] Optionally, the stop block is provided with a guide arc surface, which is bent toward the direction of the hot melt head. The guide arc surface is used to guide the airflow to move toward the direction of the hot melt head and away from the workpiece.

[0015] By adopting the above technical solution, the guiding arc surface bends towards the hot melt head, enabling the guiding arc surface to guide the airflow to flow in an orderly manner towards the hot melt head and away from the workpiece. This avoids the airflow from flowing randomly after hitting the baffle, reduces the risk of the airflow accidentally entering the welding area due to rebound, and makes the airflow after turning flow closer to the surface of the hot melt head. The wall effect is used to enhance the convective heat transfer efficiency between the airflow and the end of the hot melt head.

[0016] Optionally, the hot melt head is provided with a power component for controlling the movement of the hot melt head, and the power component operates synchronously with the first motor; when the power component drives the hot melt head to move away from the workpiece, the first motor drives the hot melt head to rotate.

[0017] By adopting the above technical solution, a power component for controlling the movement of the hot melt head is provided on the hot melt head, and the power component operates synchronously with the first motor, so that the hot melt head rotates while being withdrawn during the upward process. The guide groove and the air blowing path are separated at the moment the hot melt head begins to withdraw, realizing zero-delay isolation between the cooling airflow and the welding interface, reducing the pause time of the equipment during action switching, and improving the overall response speed of the equipment.

[0018] Optionally, the hot melt head includes a base and a working head, the working head is disposed on the base, and a heat insulation gasket is provided between the base and the working head to block the heat between the base and the working head.

[0019] By adopting the above technical solution, a heat insulation pad is provided between the substrate and the working head. This heat insulation pad can block the conduction of heat to the substrate, so that the heat generated during pulse heating is mainly concentrated in the working head area, thereby reducing ineffective heat dissipation, improving the heating efficiency of the hot melt head, shortening the time for the working head to heat up to the predetermined welding temperature, enhancing the response sensitivity of hot press welding, and reducing the heat load on the substrate and surrounding components, further improving the operational stability and lifespan of the equipment.

[0020] Optionally, the air blowing assembly includes an air source switching assembly, which is connected to an air source and an inert gas source respectively; when the hot melt head is welding, the air source switching assembly switches from the air source to the inert gas source, and the air blowing assembly blows inert gas to the welding point of the workpiece.

[0021] By adopting the above technical solution, the gas source switching component connects to the air source and the inert gas source respectively, so that the hot melt head can switch to the inert gas source to blow inert gas to the workpiece welding area during welding. The inert gas forms a local inert atmosphere protective layer in the welding area, effectively isolating oxygen, thereby inhibiting the oxidation reaction of the workpiece welding area, ensuring good wetting and diffusion of the solder, and thus improving the forming quality, connection strength and long-term reliability of the weld.

[0022] In summary, this application includes at least one of the following beneficial technical effects: The machine body is equipped with an air-blowing component for blowing air onto the hot melt head, which enables rapid cooling of the head tip. This shortens the cooling time after welding and prevents phenomena such as stringing, tailing, and bridging caused by incomplete solidification of molten material when the hot melt head separates from the workpiece. It also reduces the risk of solder joint collapse and chip misalignment, thereby improving the forming quality and positioning accuracy of the welding interface. At the same time, by timely blocking the continuous conduction of residual heat from the hot melt head to the workpiece, the heat-affected zone is reduced, preventing thermal deformation, burns, or melting of the workpiece due to local overheating. This reduces residual internal stress caused by mismatch in thermal expansion coefficients, preventing product warping and solder joint micro-cracks, thus significantly improving the welding reliability and long-term service life of the product.

[0023] By extending the guide channel towards the workpiece, the airflow from the air blowing assembly can enter the welding area of ​​the workpiece along the guide channel, avoiding the loss of cooling efficiency caused by the airflow diffusing around the hot melt head. This achieves targeted and efficient cooling of the solder joint and heat-affected zone, further suppressing phenomena such as wire drawing, tailing, solder joint collapse, and chip position displacement, thereby improving the welding quality and positional accuracy. At the same time, the cooling airflow can form a local air curtain effect between the hot melt head and the workpiece, which not only accelerates the cooling of the welding area, but also effectively blocks impurities in the external environment from entering the welding interface, and helps to promptly disperse the trace amount of fumes generated during the welding process, maintaining the cleanliness of the welding area. Attached Figure Description

[0024] Figure 1 This is a structural schematic diagram of Example 1; Figure 2 yes Figure 1 An enlarged schematic diagram of part A in the middle; Figure 3 This is a structural schematic diagram of Example 2; Figure 4 This is a partial structural diagram highlighting the guide groove in Example 2.

[0025] Reference numerals: 1. Body; 11. Power component; 12. Fixing component; 2. Base; 21. Placement slot; 3. Hot melt head; 31. Base; 32. Working head; 33. Guide channel; 34. First motor; 35. Stop block; 351. Guide arc surface; 36. Heat insulation pad; 4. Air blowing component; 41. Air source switching component. Detailed Implementation

[0026] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail. Example

[0027] This embodiment discloses a pulse hot press welding machine. (Refer to...) Figure 1 and Figure 2 A pulse hot press welding machine includes a body 1 and a base 2. The base 2 is fixedly connected to the body 1 and is used to place the workpiece to be welded. Multiple placement slots 21 for inserting workpieces are formed on the surface of the base 2 away from the ground. A hot melt head 3 for heating and welding the workpiece is movably connected to the body 1. A power component 11, which is a motor, is fixedly connected to the body 1 to control the movement of the hot melt head 3. A fixing assembly 12 is fixedly connected to the body 1 to hold the workpiece in place and prevent its position from shifting.

[0028] Reference Figure 2An air blowing assembly 4 is movably connected to the body 1 for cooling the hot melt head 3 by blowing air. The air outlet of the air blowing assembly 4 faces the end of the hot melt head 3 near the workpiece. When the hot melt head 3 finishes welding the workpiece, the air blowing assembly 4 blows air to the end of the hot melt head 3 near the workpiece to cool it down, thereby shortening the cooling waiting time after welding.

[0029] The implementation principle of Example 1 is as follows: the worker inserts multiple workpieces into the corresponding placement slots 21, then starts the device, the power component 11 drives the hot melt head 3 to weld the workpiece to be welded, and when the welding is completed, the air blowing component 4 blows air to the end of the hot melt head 3 near the workpiece to cool it down, so as to accelerate the solidification of the workpiece weld. Example

[0030] Reference Figure 3 and Figure 4 The difference between this embodiment and Embodiment 1 is that, referring to... Figure 1 A guide groove 33 is formed on the outer surface of the hot melt head 3. The guide groove 33 extends along the length of the hot melt head 3 and penetrates to the surface of the hot melt head 3 near the workpiece. The airflow blown out by the air blowing assembly 4 can enter the welding point of the workpiece along the direction of the extension of the guide groove 33 to achieve targeted and efficient cooling of the welding point.

[0031] Reference Figure 4 The end of the hot melt head 3 furthest from the workpiece is electrically connected to a first motor 34. The output of the first motor 34 is connected to the hot melt head 3, and the first motor 34 can drive the hot melt head 3 to rotate. The first motor 34 operates synchronously with the power component 11. By driving the hot melt head 3 to rotate at a certain angle, the guide groove 33 is removed from the air blowing path of the air blowing assembly 4, so as to avoid the cooling airflow forming turbulence in the narrow space, which would cause the weld joint that has not been fully solidified to be suddenly cooled and cause a cold solder joint. When the power component 11 drives the hot melt head 3 to move away from the workpiece, the first motor 34 synchronously drives the hot melt head 3 to rotate, so that the hot melt head 3 switches from the cooling surface to the isolation surface.

[0032] Reference Figure 4 A stop 35 is fixedly connected to the outer surface of the hot melt head 3. The stop 35 and the guide channel 33 are staggered. The stop 35 is used to block the airflow blown by the air blowing assembly 4 from entering the welding point of the workpiece. When the hot melt head 3 completes welding and moves away from the workpiece, the first motor 34 drives the hot melt head 3 to rotate, so that the guide channel 33 is removed from the air blowing path, and the stop 35 can rotate into the air blowing path of the air blowing assembly 4 to block the airflow from entering the welding point of the workpiece.

[0033] Reference Figure 4The stop block 35 has a guide arc surface 351 on its surface away from the workpiece. The guide arc surface 351 bends toward the hot melt head 3. The guide arc surface 351 can guide the airflow toward the hot melt head 3 and away from the workpiece, so that the airflow can turn and flow closer to the surface of the hot melt head 3, thereby improving the cooling efficiency of the hot melt head 3.

[0034] Reference Figure 4 The hot melt head 3 includes a base 31 and a working head 32. The working head 32 is integrally formed on the base 31 and is used for welding workpieces. A heat insulation pad 36 is fixedly connected between the base 31 and the working head 32. The heat insulation pad is made of aerogel or ceramic material. The heat insulation pad 36 is used to block the heat between the base 31 and the working head 32, so that the heat can be concentrated in the area of ​​the working head 32, thereby improving the heating efficiency and response speed of the end of the hot melt head 3.

[0035] Reference Figure 4 The air blowing assembly 4 includes an air source switching assembly 41, which is connected to both an air source and an inert gas source. When the hot melt head 3 welds the workpiece, the air source switching assembly 41 switches from the air source to the inert gas source, and the air blowing assembly 4 blows inert gas onto the weld joint of the workpiece to suppress high-temperature oxidation during the welding process. After the hot melt head 3 finishes welding the workpiece, the air source switching assembly 41 switches from the inert gas source back to the air source, and the air blowing assembly 4 blows air to achieve cooling.

[0036] The implementation principle of Example 2 is as follows: The worker places the workpiece to be welded on the base 2, and then drives the hot melt head 3 to heat and weld the workpiece through the power component 11. After welding, the air blowing component 4 blows air to the end of the hot melt head 3 to cool it down. While the hot melt head 3 moves away from the workpiece, the first motor 34 drives the hot melt head 3 to rotate, so that the guide groove 33 is separated from the air blowing path of the air blowing component 4. The baffle 35 can rotate into the air blowing path of the air blowing component 4 to block the airflow from entering the welding point of the workpiece. The airflow blocked by the baffle 35 flows along the guide arc surface 351 toward the surface of the hot melt head 3 to improve the cooling efficiency of the hot melt head 3 and prevent the incompletely solidified weld point from being suddenly cooled and causing a false weld.

[0037] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0038] The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the design concept of this application should be included within the protection scope of this application.

Claims

1. A pulse hot press welding machine, comprising a body (1) and a base (2), wherein the base (2) is disposed on the body (1), the base (2) is used to place the workpiece to be welded, and the body (1) is provided with a hot melt head (3) for heating and welding the workpiece, characterized in that: The body (1) is provided with an air blowing assembly (4) for blowing air onto the hot melt head (3); when the hot melt head (3) finishes welding the workpiece, the air blowing assembly (4) blows air onto the end of the hot melt head (3) near the workpiece to cool it down.

2. The pulse hot press welding machine according to claim 1, characterized in that: The hot melt head (3) is provided with a guide groove (33), which extends toward the workpiece, and the airflow blown out by the air blowing assembly (4) can enter the welding point of the workpiece along the guide groove (33).

3. The pulse hot press welding machine according to claim 2, characterized in that: The hot melt head (3) is equipped with a first motor (34), the output end of the first motor (34) is connected to the hot melt head (3), and the first motor (34) is used to drive the hot melt head (3) to rotate; when the hot melt head (3) moves away from the workpiece, the first motor (34) drives the hot melt head (3) to rotate, and the guide groove (33) is separated from the air blowing path of the air blowing assembly (4).

4. The pulse hot press welding machine according to claim 1, characterized in that: The hot melt head (3) is provided with a baffle (35), which is located on the moving path of the airflow blowing towards the end of the hot melt head (3). The baffle (35) is used to block the airflow from entering the welding point of the workpiece.

5. A pulse hot press welding machine according to claim 4, characterized in that: The stop block (35) has a guide arc surface (351) which bends toward the hot melt head (3) and is used to guide the airflow toward the hot melt head (3) and away from the workpiece.

6. A pulse hot press welding machine according to claim 1, characterized in that: The hot melt head (3) is provided with a power component (11) for controlling the movement of the hot melt head (3). The power component (11) operates synchronously with the first motor (34). When the power component (11) drives the hot melt head (3) to move away from the workpiece, the first motor (34) drives the hot melt head (3) to rotate.

7. A pulse hot press welding machine according to claim 1, characterized in that: The hot melt head (3) includes a base (31) and a working head (32). The working head (32) is disposed on the base (31). A heat insulation pad (36) is provided between the base (31) and the working head (32). The heat insulation pad (36) is used to block the heat between the base (31) and the working head (32).

8. A pulse hot press welding machine according to claim 1, characterized in that: The blowing assembly (4) includes a gas source switching assembly (41), which is connected to an air source and an inert gas source respectively. When the hot melt head (3) is welding, the gas source switching assembly (41) switches from the air source to the inert gas source, and the blowing assembly (4) blows inert gas to the welding point of the workpiece.

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