Brazing welding process for needle plate radiator

Abstract

The invention discloses a brazing process for a needle plate radiator, and relates to the field of brazing devices. The invention discloses a brazing welding process for a needle plate radiator. The brazing welding process comprises the following steps: step 1, pretreating the surface of a weldment; the heat dissipation needle plate, the radiator bottom plate and the cavity are pretreated, and impurities, oil stains and oxide layers on the surfaces and in the heat dissipation needle plate, the radiator bottom plate and the cavity are removed; 2, needle face drill pieces are assembled; the processed heat dissipation needle plate and the radiator bottom plate are assembled in a lap joint mode through a brazing welding assembly machine, that is, the heat dissipation needle plate is connected to a cavity in the radiator bottom plate in an inserted mode, and the cavity in the heat dissipation needle plate is made to communicate with the cavity in the radiator bottom plate; according to the invention, the brazed radiator is placed in a sealed environment, and the sealing performance of the brazed part of the radiator is detected in a mode of internal and external synchronous pressurization, so that the existence of pseudo soldering and solder skips is reduced, the leakage of cooling liquid caused by pseudo soldering in the subsequent use process is effectively avoided, and the use of the radiator is facilitated.

Description

Technical Field

[0001] The invention belongs to the technical field of brazing welding devices, and in particular relates to a brazing welding process for a pin plate radiator. Background Art

[0002] In the brazing quality inspection of pin-plate radiators, existing technologies often use visual inspection methods such as camera shooting to judge whether there are defects such as cold soldering by observing the appearance of the welding parts (such as whether the solder filling is full and whether there are obvious gaps).

[0003] However, this method is relatively weak in detecting cold solder joints. Such radiators with hidden cold solder joints may be judged as qualified in the initial inspection. However, in the subsequent use, with the vibration and thermal expansion and contraction cycles generated by the long-term operation of the equipment (such as temperature increase during heat dissipation and temperature decrease during shutdown), the hidden defects will gradually expand, and eventually cause the radiator to leak after a period of use (such as coolant leakage from the liquid cooling channel), which not only affects the heat dissipation efficiency, but may also cause chain problems such as equipment short circuit and component damage due to leakage. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a brazing welding device that can overcome the above problems or at least partially solve the above problems.

[0005] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: a pin plate radiator brazing welding process, comprising the following steps: Step 1: Surface pretreatment of weldment Pre-treat the heat sink pin plate, radiator base plate and chamber to remove impurities, oil stains and oxide layers on the surface and inside; Step 2: Needle face drill bit assembly The processed heat dissipation pin plate and the radiator base plate are overlapped and assembled by a brazing welding assembly machine, that is, the heat dissipation pin plate is plugged into the cavity inside the radiator base plate, so that the cavity inside the heat dissipation pin plate is connected with the cavity inside the radiator base plate; Step 3: Pin-side soldering Use a brazing welding assembly machine to braze the connection between the plugged heat dissipation pin plate and the radiator base plate; Step 4: Testing and Verification The brazed radiator is transported to the testing box via a conveyor belt, where internal and external pressurization is performed synchronously to test the welding tightness of the radiator. Step 5: Drying The radiator that has been tested and calibrated is transported to a drying box via a conveyor belt, and the test liquid remaining in the chamber is dried and discharged through the drying box.

[0006] Furthermore, the detection box is a box with an open top, and a sealing cover is slidably connected to the top of the detection box. The sealing cover is used to seal the top of the detection box to form an enclosed space. The sealing cover is provided with an air inlet and an air outlet, and the air outlet is used to increase the air pressure in the detection box, and an air pressure sensor is installed in the detection box.

[0007] Furthermore, a placement plate is installed in the detection box for placing the radiator after brazing.

[0008] Furthermore, a liquid storage tank is installed on the detection box, a water pump is installed in the liquid storage tank, a liquid outlet pipe is connected to the liquid outlet end of the water pump, the liquid outlet end of the liquid outlet pipe is connected to the liquid inlet end of the chamber in the radiator base plate, and is used to inject the detection liquid into and fill the chamber in the radiator base plate, and a liquid pressure valve is installed in the liquid outlet pipe.

[0009] Furthermore, an air pump is installed on the detection box, an air outlet end of the air pump is connected to an air outlet pipe, and the air outlet end of the air outlet pipe is connected to the air inlet on the sealing cover.

[0010] Furthermore, a camera is installed at the bottom of the sealing cover for monitoring the radiator.

[0011] Furthermore, a hydraulic cylinder is fixedly connected to the detection box, and a telescopic end of the hydraulic cylinder is fixedly connected to the sealing cover.

[0012] Furthermore, two groups of clamping plates are slidably connected to the placement plate, and the clamping plates are used to clamp both sides of the radiator to fix it.

[0013] Furthermore, two groups of telescopic cylinders are fixedly connected in the detection box, and connecting rods are fixedly connected to the telescopic ends of the telescopic cylinders, and the connecting rods are fixedly connected to the clamping plates.

[0014] Furthermore, the placement plate is provided with an empty slot, and the connecting rod is slidably connected in the empty slot.

[0015] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: the present invention places the brazed radiator in a sealed environment, and performs sealing detection on the brazing part of the radiator by synchronously pressurizing the inside and outside, thereby reducing the existence of cold welds and leaked welds, effectively avoiding coolant leakage caused by cold welds during subsequent use, and facilitating the use of the radiator. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In the attached figure: Figure 1 This is a structural schematic diagram of a pin plate radiator brazing welding process proposed by the present invention; Figure 2 This is a schematic diagram of the structure of the detection box in the pin plate radiator brazing process proposed by the present invention. Figure 1 ; Figure 3 A pin plate radiator brazing welding process proposed by the present invention Figure 2 Schematic diagram of the structure of part A; Figure 4 This is a schematic diagram of the structure of the detection box in the pin plate radiator brazing process proposed by the present invention. Figure 2 ; Figure 5 This is a schematic cross-sectional view of a detection box in a pin-plate radiator brazing process proposed by the present invention; Figure 6 This is a structural schematic diagram of a plate placed in a detection box in a pin-plate radiator brazing process proposed by the present invention.

[0017] In the figure: 1. Brazing welding assembly machine; 2. Conveyor belt; 301. Inspection box; 302. Sealing cover; 303. Camera; 304. Placement plate; 305. Empty slot; 306. Telescopic cylinder; 307. Connecting rod; 308. Clamping plate; 309. Air pressure sensor; 4. Hydraulic cylinder; 501. Air pump; 502. Air outlet pipe; 503. Air outlet; 6. Liquid storage tank; 601. Water pump; 602. Liquid outlet pipe; 7. Drying box. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0019] Example: Refer to Figure 1-6 , a pin plate radiator brazing welding process, comprising the following steps: Step 1: Surface pretreatment of weldment Pre-treat the heat sink pin plate, radiator base plate and chamber to remove impurities, oil stains and oxide layers on the surface and inside; Step 2: Needle face drill bit assembly The processed heat dissipation pin plate and the radiator base plate are overlapped and assembled by the brazing welding assembly machine 1, that is, the heat dissipation pin plate is plugged into the cavity inside the radiator base plate, so that the cavity inside the heat dissipation pin plate is connected with the cavity inside the radiator base plate; Step 3: Pin-side soldering The connection between the inserted heat dissipation pin plate and the heat sink bottom plate is brazed by the brazing welding assembly machine 1; Step 4: Testing and Verification The brazed radiator is transported to the testing box 301 by the conveyor belt 2, and the testing box 301 is pressurized internally and externally synchronously to test the welding tightness of the radiator; Step 5: Drying The radiator that has been tested and calibrated is conveyed to a drying box 7 via a conveyor belt 2 , and the test liquid remaining in the chamber is dried and discharged via the drying box 7 .

[0020] The detection box 301 is a box with an open top. A sealing cover 302 is slidably connected to the top of the detection box 301. The sealing cover 302 is used to seal the top of the detection box 301 to form an enclosed space. The sealing cover 302 is provided with an air inlet and an air outlet 503. The air outlet 503 is used to increase the air pressure in the detection box 301. An electromagnetic valve is installed in the air outlet 503, and an air pressure sensor 309 is installed in the detection box 301.

[0021] A placement plate 304 is installed in the detection box 301 for placing the radiator after brazing.

[0022] A liquid storage tank 6 is installed on the detection box 301, and a water pump 601 is installed in the liquid storage tank 6. A liquid outlet pipe 602 is connected to the liquid outlet end of the water pump 601. The liquid outlet end of the liquid outlet pipe 602 is connected to the liquid inlet end of the chamber in the radiator base plate, which is used to inject the detection liquid into and fill the chamber in the radiator base plate. A liquid pressure valve and a solenoid valve are installed in the liquid outlet pipe 602.

[0023] An air pump 501 is installed on the detection box 301 . An air outlet pipe 502 is connected to the air outlet end of the air pump 501 . The air outlet end of the air outlet pipe 502 is connected to the air inlet on the sealing cover 302 .

[0024] A camera 303 is installed at the bottom of the sealing cover 302 for monitoring the radiator.

[0025] The detection box 301 is fixedly connected to a hydraulic cylinder 4 , and the telescopic end of the hydraulic cylinder 4 is fixedly connected to the sealing cover 302 .

[0026] Two sets of clamping plates 308 are slidably connected to the placement plate 304 , and the clamping plates 308 are used to clamp two sides of the radiator to fix it.

[0027] Two sets of telescopic cylinders 306 are fixedly connected in the detection box 301 . The telescopic ends of the telescopic cylinders 306 are fixedly connected to connecting rods 307 . The connecting rods 307 are fixedly connected to the clamping plates 308 .

[0028] An empty slot 305 is provided on the placement plate 304 , and the connecting rod 307 is slidably connected in the empty slot 305 .

[0029] The brazing welding assembly machine 1 adopts Panasonic YASKAWA Motoman MA1440.

[0030] The specific steps for using this device are as follows: Step 1: Surface pretreatment of weldment Pre-treat the heat sink pin plate, radiator base plate, and chamber to remove impurities, oil stains, and oxide layers on the surface and inside. The specific operations are as follows: Treatment of heat sink pin plate and base plate: Use a robot or manual labor to place the heat sink pin plate and radiator base plate in the cleaning station in turn, and use high-pressure cleaning equipment to spray alkaline degreasers and other cleaning agents to remove surface oil and impurities; use grinding tools to gently polish the areas with oxide layers to restore the activity of the metal surface; after the treatment is completed, use hot air drying or natural drying to ensure that the surface is dry and clean.

[0031] Cleaning the inside of the chamber: For the chambers of the radiator base plate and the heat dissipation needle plate, use a high-pressure air gun to blow out internal impurities, oxide scale, etc.; if necessary, the chamber connection port can be immersed in a cleaning agent and assisted by ultrasonic cleaning to ensure that there are no residual pollutants inside the chamber, providing good surface conditions for subsequent brazing.

[0032] Step 2: Needle face drill bit assembly The processed heat dissipation pin plate and the radiator base plate are overlapped and assembled by the brazing welding assembly machine 1, that is, the heat dissipation pin plate is plugged into the cavity inside the radiator base plate, so that the cavity inside the heat dissipation pin plate is connected with the cavity inside the radiator base plate. The process is as follows: Equipment initialization: Start the brazing welding assembly machine 1, perform equipment zero point calibration and program initialization, and ensure accurate positioning of each motion axis and actuator, such as the robotic arm and the plug-in tooling.

[0033] Workpiece loading: The robot or manual operator places the heat sink needle plate and radiator base plate that have completed surface pretreatment on the corresponding loading stations of the brazing assembly machine 1, and uses the positioning fixture to achieve preliminary positioning to ensure the subsequent plug-in accuracy.

[0034] Plug-in assembly: The robotic arm of the brazing and welding assembly machine 1 drives the heat dissipation needle plate and accurately aligns it with the radiator base plate according to the preset program; using plug-in tooling such as guide pins and pressing mechanisms, the heat dissipation needle plate is smoothly plugged into the internal cavity of the radiator base plate to ensure that the heat dissipation needle plate cavity is accurately connected with the radiator base plate cavity to complete the overlap assembly.

[0035] Step 3: Pin-side soldering Use the brazing welding assembly machine 1 to braze the connection between the plugged heat sink pin plate and the radiator base plate. The operation process is as follows: Preparation and pre-setting of solder: According to the material of the heat sink needle plate and the radiator base plate, for example, aluminum-based solder is used for aluminum, and copper-based solder is used for copper. Prepare suitable solder, such as brazing sheet and brazing wire. Through the solder pre-setting mechanism of the brazing assembly machine 1, the solder is accurately placed at the connection between the heat sink needle plate and the radiator base plate, such as the brazing sheet fits the seam and the brazing wire is arranged in the welding area.

[0036] Brazing execution: The brazing welding assembly machine 1 starts the welding program and heats the joint through induction heating, flame heating or laser heating according to the settings of the machine used; when the temperature reaches the melting temperature of the brazing material, the brazing material melts and fills the joint to form a brazed joint; during the welding process, protective gas is continuously introduced to create an inert environment and ensure the welding quality; after welding is completed, the cooling rate is controlled to ensure that the brazing joint cools evenly, completing the pin-side brazing piece welding.

[0037] Step 4: Testing and Verification 1. Radiator loading and pipe connection After brazing, the radiator is brazed by the brazing assembly machine 1 and initially transported by the conveyor belt 2 to the inspection area next to the inspection station. The radiator is grabbed by a robot or manually and moved to the operating area in front of the inspection box 301. The liquid outlet pipe 602 is quickly inserted into the liquid inlet end of the radiator to ensure a tight connection in preparation for subsequent liquid injection.

[0038] 2. Internal injection and cavity drainage Start the water pump 601 in the liquid storage tank 6, and the detection liquid is injected into the radiator bottom plate and the connected heat dissipation needle plate chamber through the liquid outlet pipe 602. During the injection process, closely observe the liquid outlet end of the radiator. When the liquid outlet end begins to flow out of the detection liquid, it indicates that the chamber is full of detection liquid. There may be a small amount of gas residual inside, but most of it is already filled with detection liquid.

[0039] Then quickly seal the liquid outlet of the radiator with a sealing plug. At this time, the inside of the radiator is filled with test liquid. Since the injection process is controllable, the internal liquid pressure is maintained at a low level close to normal pressure or slightly higher. Then turn off the water pump 601 to complete the internal injection and chamber filling and sealing steps.

[0040] 3. Boxing and Fixing A robot or a human will place the radiator that has been filled and sealed onto the placement plate 304 in the test box 301, and start the telescopic cylinder 306. Its telescopic end pushes the connecting rod 307 to slide along the empty slot 305 of the placement plate 304, driving the two sets of clamping plates 308 to move closer, firmly clamping the two sides of the radiator to prevent the displacement of the radiator during the test from affecting the results.

[0041] 4. Sealing and initial state The telescopic end of the control hydraulic cylinder 4 is extended to push the sealing cover 302 down, completely covering the top opening of the detection box 301 to form a closed space. At this time, the solenoid valve of the air outlet 503 is closed, and the initial air pressure inside and outside the detection box 301 is balanced with the atmospheric pressure. The air pressure sensor 309 monitors the air pressure in the box in real time to prepare for subsequent pressurization.

[0042] 5. Synchronous internal and external pressurization External air pressure pressurization: Start the air pump 501, and the compressed gas is delivered to the air inlet of the sealing cover 302 through the outlet pipe 502 to inflate the enclosed space of the test box 301. The air pressure sensor 309 provides feedback to control the inflation pressure to a preset value, such as 0.3-1.5 MPa, which is determined according to the radiator tolerance and test standards to establish an external high-pressure environment.

[0043] Internal liquid pressurization coordination: As the air pressure inside the test box 301 increases, the water pump 601 starts synchronously, continues to inject test liquid into the radiator, and synchronously monitors the hydraulic pressure through the liquid pressure sensor. At this time, the hydraulic pressure is within the set range and cooperates with the air pressure sensor 309 to ensure that the pressure does not exceed the tolerance limit of the radiator to avoid damage.

[0044] 6. Sealing monitoring and determination Visual monitoring: The camera 303 at the bottom of the sealing cover 302 monitors the radiator surface in real time throughout the entire process. If there are cold joints or leaking welds at the brazing points, the external high pressure will cause the detection liquid to leak from the defective areas. The camera 303 will capture the leakage traces, such as the detection liquid seeping out or flowing, and it can be visually judged as unqualified.

[0045] Maintain the pressurized state for a certain period of time, such as 3-10 minutes, during which continuous monitoring is performed to complete the sealing test.

[0046] 7. Reset and Shunt after Detection Pressure relief and liquid drainage: After the test is completed, first open the solenoid valve at the air outlet 503 to slowly release the high-pressure gas in the test box 301 to restore it to atmospheric pressure; then remove the plug at the liquid outlet, pull out the liquid outlet pipe 602 at the liquid inlet, and drain the test liquid in the radiator chamber by a robot or manual operation, which can be recovered to the liquid storage tank 6 for recycling.

[0047] Qualified determination and diversion: Radiators that have been monitored to be leak-free are transported by conveyor belt 2 to the drying box 7 to dry and discharge the residual test liquid in the chamber; Radiators that are determined to be unqualified are transferred to the unqualified product area for subsequent individual defect analysis, repair or scrapping.

[0048] 5. Step 5: Drying The radiator that has been tested and calibrated is transported to the drying box 7 by the conveyor belt 2, and the test liquid remaining in the chamber is dried and discharged by the drying box 7, as follows: Loading and drying parameter setting: Conveyor belt 2 delivers qualified radiators into drying box 7, and closes the door of drying box 7; according to the characteristics of the test liquid such as boiling point and residual amount, set the drying temperature such as 80-120℃ and the drying time such as 10-30 minutes, and start the drying program.

[0049] Drying execution and dehumidification: The heating element in the drying box 7 works to evaporate the residual test liquid in the radiator chamber; the dehumidification system in the box, such as the exhaust fan and condensation dehumidification device, runs synchronously to discharge water vapor and ensure that the chamber is dry.

[0050] Unloading and finished product preparation: After drying is completed, the drying box 7 is cooled to room temperature, the box door is opened, and the conveyor belt 2 transports the dried radiator to the finished product temporary storage area or subsequent packaging station, completing the entire brazing welding process.

[0051] Throughout the entire process, various equipment components work together to form a complete production loop. After the brazing and welding assembly machine 1 completes assembly and welding, the conveyor belt 2 acts as a transport link to transfer the radiator to the subsequent process. The clamping plate 308, telescopic cylinder 306 and other components in the inspection box 301 ensure that the workpiece is stable during inspection. The air pump 501, water pump 601 and various sensors work together to achieve pressure control, and the camera 303 provides intuitive visual monitoring data. The core advantage of this process lies in its comprehensive coverage of quality control points, from surface cleanliness control in the pretreatment stage, to positioning accuracy control during assembly, to temperature and cooling rate adjustment during welding, and to internal and external synchronous pressurization simulation in the inspection stage. Compared with traditional inspection methods, it can more accurately identify potential defects such as hidden cold solder joints, greatly reduce the risk of leakage in subsequent use, and provide reliable protection for the long-term stable operation of the radiator.

[0052] The present invention places the brazed radiator in a sealed environment and performs sealing detection on the brazing part of the radiator by synchronously pressurizing the inside and outside, thereby reducing the presence of cold welds and leaked welds, effectively avoiding coolant leakage caused by cold welds during subsequent use, and facilitating the use of the radiator.

[0053] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with the present invention can make slight changes or modifications to equivalent embodiments using the above-mentioned technical contents without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. A pin plate radiator brazing welding process, characterized in that, The following steps are involved: Step 1: Surface pretreatment of weldment Pre-treat the heat sink pin plate, radiator base plate and chamber to remove impurities, oil stains and oxide layers on the surface and inside; Step 2: Needle face drill bit assembly The processed heat dissipation needle plate and the radiator base plate are overlapped and assembled by a brazing welding assembly machine (1), that is, the heat dissipation needle plate is plugged into the cavity inside the radiator base plate, so that the cavity inside the heat dissipation needle plate is connected with the cavity inside the radiator base plate; Step 3: Pin-side soldering Brazing the connection between the inserted heat dissipation pin plate and the heat sink base plate by a brazing welding assembly machine (1); Step 4: Testing and Verification The brazed radiator is transported to the testing box (301) via a conveyor belt (2), and the welding tightness of the radiator is tested by synchronously applying internal and external pressurization to the testing box (301); Step 5: Drying The radiator that has been tested and calibrated is transported to a drying box (7) via a conveyor belt (2), and the test liquid remaining in the chamber is dried and discharged via the drying box (7).

2. A pin plate radiator brazing welding process according to claim 1, characterized in that: The detection box (301) is a box body with an open top. A sealing cover (302) is slidably connected to the top of the detection box (301). The sealing cover (302) is used to seal the top of the detection box (301) to form a closed space. An air inlet and an air outlet (503) are provided on the sealing cover (302). The air outlet (503) is used to increase air pressure in the detection box (301). A solenoid valve is installed in the air outlet (503), and an air pressure sensor (309) is installed in the detection box (301).

3. A pin plate radiator brazing welding process according to claim 2, characterized in that: A placement plate (304) is installed in the detection box (301) for placing the radiator after brazing.

4. A pin plate radiator brazing welding process according to claim 3, characterized in that: A liquid storage tank (6) is installed on the detection box (301), a water pump (601) is installed in the liquid storage tank (6), a liquid outlet pipe (602) is connected to the liquid outlet end of the water pump (601), the liquid outlet end of the liquid outlet pipe (602) is connected to the liquid inlet end of the chamber in the radiator bottom plate, and is used to inject the detection liquid into and fill the chamber in the radiator bottom plate, and a liquid pressure valve and a solenoid valve are installed in the liquid outlet pipe (602).

5. A pin plate radiator brazing welding process according to claim 4, characterized in that: An air pump (501) is installed on the detection box (301), an air outlet pipe (502) is connected to the air outlet end of the air pump (501), and the air outlet end of the air outlet pipe (502) is connected to the air inlet on the sealing cover (302).

6. A pin plate radiator brazing welding process according to claim 5, characterized in that: A camera (303) is installed at the bottom of the sealing cover (302) for monitoring the radiator.

7. The pin plate radiator brazing welding process according to claim 2, characterized in that: A hydraulic cylinder (4) is fixedly connected to the detection box (301), and a telescopic end of the hydraulic cylinder (4) is fixedly connected to the sealing cover (302).

8. The pin plate radiator brazing welding process according to claim 3, characterized in that: Two groups of clamping plates (308) are slidably connected to the placement plate (304), and the clamping plates (308) are used to clamp two sides of the radiator to fix it.

9. A pin plate radiator brazing welding process according to claim 8, characterized in that: Two sets of telescopic cylinders (306) are fixedly connected in the detection box (301), and connecting rods (307) are fixedly connected to the telescopic ends of the telescopic cylinders (306), and the connecting rods (307) are fixedly connected to the clamping plates (308).

10. A pin plate radiator brazing welding process according to claim 9, characterized in that: An empty slot (305) is provided on the placement plate (304), and the connecting rod (307) is slidably connected in the empty slot (305).

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