High-frequency welding process for cooling fins

Abstract

The invention discloses a high-frequency welding process for a cooling fin, which comprises the following process steps of: step 1, preparing materials: preparing corresponding materials to be welded and a jig according to requirements, cleaning the jig, and then loading the materials into the jig; 2, tin brushing, wherein solder paste is printed on the portion, needing to be welded, of the heat dissipation module through a steel mesh in a skip printing mode; 3, high-frequency welding is conducted, specifically, the whole jig is put into equipment to be heated for high-frequency welding; 4, testing, wherein a retention force test and a destructive force test are conducted on the product subjected to high-frequency welding; and step 5, packaging: packaging the tested product. The high-frequency welding process is adopted, so that the welding effect is good, the retention force is high, and the impact resistance is high.

Description

Technical Field

[0001] The invention relates to the technical field of radiator production, and in particular to a high-frequency welding process for radiators. Background Art

[0002] Heat sinks are usually made by coating a silicone composition containing a thermally conductive filler (hereinafter referred to as the silicone composition) on both sides of a reinforcing layer such as glass cloth. Due to its excellent properties such as high thermal conductivity, electrical insulation, and handleability, it is used in the field of electronic materials to cool heat-generating electronic components by adhering to the interface between electronic components and heat dissipation parts such as radiators or circuit boards.

[0003] During the production process of the radiator, the heat sink of the radiator must first be tinned and then assembled and welded. The existing welding process generally uses reflow soldering, but the reflow soldering process is complicated, and the holding force and resistance are poor, which cannot meet customer needs. Therefore, a high-frequency welding process for heat sinks is designed. Summary of the invention

[0004] The purpose of the present invention is to provide a high-frequency welding process for heat sinks in view of the deficiencies of the prior art. The high-frequency welding process for heat sinks has good welding effect, strong holding force and strong resistance.

[0005] To achieve the above object, the present invention is implemented through the following technical solutions.

[0006] A high frequency welding process for heat sinks includes the following process steps:

[0007] Step 1: Material preparation: Prepare the corresponding materials and jigs to be welded as needed, clean the jigs, and then load the materials into the jigs;

[0008] Step 2: Brush tin: Use a steel mesh to print solder paste on the parts of the heat dissipation module that need to be soldered;

[0009] Step 3: High-frequency welding: Place the entire fixture into the equipment and heat it for high-frequency welding;

[0010] Step 4, testing: Conduct holding force test and destructive force test on the products after high frequency welding;

[0011] Step 5, Packaging: Pack the tested products.

[0012] Among them, in the step one, after preparing the materials, it is necessary to check that the surface of the material to be welded has no bruises, scratches, knife marks or steps, the bottom film has no deformation or warping, the heat sink has no deformation, damage or missing materials; the surface of the material has no dirt, oil stains, fingerprints, or poor oxidation; the nickel plating layer has no bottom exposure, bubbles, or plating loss.

[0013] Among them, in the step 1, the positioning jig of the screen printing solder paste is soaked and cleaned with decontamination water every 4 hours. At the same time, before each spring piece is loaded into the jig, the positioning jig is carefully checked to see if there is any solder paste residue. Any residue must be picked out and isolated.

[0014] Wherein, in the step 2, the solder paste needs to be reheated and activated;

[0015] Solder paste temperature return: Solder paste must be returned to temperature for more than 4 hours before use on the same day, and must be placed in a solder paste mixer and stirred for 4-5 minutes before use;

[0016] Activate solder paste: Pour an appropriate amount of reheated solder paste on the steel mesh, adjust the machine to enter manual mode, operate the scraper to perform screen printing solder paste actions in the left and right cycles respectively, and repeat the above actions until the solder paste has good rolling properties before leak printing.

[0017] Among them, in the step 2, missing prints need to be checked, check whether the jig loaded in the previous process is accurately loaded into the positioning groove, whether there is any misalignment, whether the product is deformed, remove the silk-screened heat sink assembly together with the jig and check that the silk-screen surface should not have quality defects such as missing prints, short circuits, misprints or insufficient solder paste; the amount of solder paste at the soldering position should not be less than the corresponding steel mesh thickness, and the size should cover the entire welding position as a qualified standard.

[0018] Among them, in the step three, during high-frequency welding, the assembled fixture is placed on the tray, and the device starts heating after sensing the product. The workpiece is evenly heated to 160°C within 20 seconds. After keeping warm for 5 seconds, the fixture is pushed into the cooling station for air cooling. The welding process is completed within 10 seconds. The next step can be started only after all temperature measuring points meet 160°C, otherwise the machine alarms and automatically returns.

[0019] Among them, in the step 4, the holding force test is to use a thrust gauge to press on the heat sink and then gradually apply pressure downward. When the lateral thrust is greater than 480N, the heat sink does not fall off and the product is good.

[0020] The beneficial effects of the present invention are as follows: the high-frequency welding process for heat sinks described in the present invention includes the following process steps: Step 1, material preparation: prepare the corresponding materials and jigs to be welded as needed, clean the jigs, and then load the materials into the jigs; Step 2, tin brushing: use a steel mesh to leak tin paste on the parts of the heat dissipation module that need to be welded; Step 3, high-frequency welding: put the entire jig into the equipment and heat it for high-frequency welding; Step 4, testing: perform retention and destructive force tests on the products after high-frequency welding; Step 5, packaging: pack the tested products. The present invention has good welding effect, strong retention, and strong resistance by adopting the high-frequency welding process. DETAILED DESCRIPTION

[0021] The present invention is described below in conjunction with specific implementation methods.

[0022] A high frequency welding process for heat sinks includes the following process steps:

[0023] Step 1: Material preparation: Prepare the corresponding materials and jigs to be welded as needed, clean the jigs, and then load the materials into the jigs;

[0024] Step 2: Brush tin: Use a steel mesh to print solder paste on the parts of the heat dissipation module that need to be soldered;

[0025] Step 3: High-frequency welding: Place the entire fixture into the equipment and heat it for high-frequency welding;

[0026] Step 4, testing: Conduct holding force test and destructive force test on the products after high frequency welding;

[0027] Step 5, Packaging: Pack the tested products.

[0028] Furthermore, in the step one, after preparing the materials, it is necessary to inspect the surface of the material to be welded for free of bruises, scratches, knife marks, steps, deformation or warping of the bottom film, deformation, damage or missing material of the heat sink; free of dirt, oil stains, fingerprints or poor oxidation on the surface of the material; and free of bottom exposure, blistering or plating shedding on the nickel plating layer.

[0029] Furthermore, in the step 1, the positioning jig for screen printing solder paste is cleaned by soaking it in decontamination water every 4 hours. At the same time, before each shrapnel is loaded into the jig, the positioning jig is carefully checked to see if there is any solder paste residue. Any residue must be picked out and isolated.

[0030] Furthermore, in step 2, the solder paste needs to be reheated and activated;

[0031] Solder paste temperature return: Solder paste must be returned to temperature for more than 4 hours before use on the same day, and must be placed in a solder paste mixer and stirred for 4-5 minutes before use;

[0032] Activate solder paste: Pour an appropriate amount of reheated solder paste on the steel mesh, adjust the machine to enter manual mode, operate the scraper to perform screen printing solder paste actions in the left and right cycles respectively, and repeat the above actions until the solder paste has good rolling properties before leak printing.

[0033] Furthermore, in the step 2, missing prints need to be checked to check whether the jig installed in the previous process is accurately installed in the positioning groove, whether there is any misalignment, whether the product is deformed, and the silk-screened heat sink assembly together with the jig is removed and checked. The silk-screen surface should not have quality defects such as missing prints, short circuits, misprints or insufficient solder paste; the amount of solder paste at the soldering position should not be less than the corresponding steel mesh thickness, and the size should cover the entire welding position as a qualified standard.

[0034] Furthermore, in the step three, during high-frequency welding, the assembled fixture is placed on the tray, and the device starts heating after sensing the product. The workpiece is evenly heated to 160°C within 20 seconds. After being kept warm for 5 seconds, the fixture is pushed into the cooling station for air cooling. The welding process is completed within 10 seconds. The next step can be started only after all temperature measuring points meet 160°C, otherwise the machine alarms and automatically returns.

[0035] Furthermore, in step 4, the holding force test is to use a thrust gauge to press on the heat sink and then gradually apply pressure downward. When the lateral thrust is greater than 480N, the heat sink does not fall off and the product is good.

[0036] Further explanation is needed. The present invention adopts a high-frequency welding process, which has good welding effect, strong holding force, and strong resistance.

[0037] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The content of this specification should not be understood as limiting the present invention.

Claims

1. A high frequency welding process for heat sink, characterized in that: The process steps include: Step 1: Material preparation: Prepare the corresponding materials and jigs to be welded as needed, clean the jigs, and then load the materials into the jigs; Step 2: Brush tin: Use a steel mesh to print solder paste on the parts of the heat dissipation module that need to be soldered; Step 3: High-frequency welding: Place the entire fixture into the equipment and heat it for high-frequency welding; Step 4, testing: Conduct holding force test and destructive force test on the products after high frequency welding; Step 5, Packaging: Pack the tested products.

2. A high frequency welding process for heat sink according to claim 1, characterized in that: In the step 1, after the material is prepared, it is necessary to check that the surface of the material to be welded has no bruises, scratches, knife marks or steps, the bottom film has no deformation or warping, the heat sink has no deformation, damage or missing material; the surface of the material has no dirt, oil stains, fingerprints, or poor oxidation; the nickel plating layer has no bottom exposure, bubbles, or plating loss.

3. The high frequency welding process for heat sink according to claim 1, characterized in that: In the step 1, the positioning jig for screen printing solder paste is cleaned by soaking it in decontamination water every 4 hours. At the same time, before each shrapnel is loaded into the jig, the positioning jig is carefully checked to see if there is any solder paste residue. Any residue must be picked out and isolated.

4. The high frequency welding process for heat sink according to claim 1, characterized in that: In the step 2, the solder paste needs to be reheated and activated; Solder paste temperature return: Solder paste must be returned to temperature for more than 4 hours before use on the same day, and must be placed in a solder paste mixer and stirred for 4-5 minutes before use; Activate solder paste: Pour an appropriate amount of reheated solder paste on the steel mesh, adjust the machine to enter manual mode, operate the scraper to perform screen printing solder paste actions in the left and right cycles respectively, and repeat the above actions until the solder paste has good rolling properties before leak printing.

5. The high frequency welding process for heat sink according to claim 1, characterized in that: In the step 2, missing prints need to be checked to see whether the jig installed in the previous process is accurately installed in the positioning slot, whether there is any misalignment, whether the product is deformed, and the silk-screened heat sink assembly and jig are removed together and checked. There should be no quality defects such as missing prints, short circuits, misprints or insufficient solder paste on the silk-screen surface; the amount of solder paste at the soldering position should be no less than the corresponding steel mesh thickness, and the size should cover the entire welding position as the qualified standard.

6. The high frequency welding process for heat sink according to claim 1, characterized in that: In the step three, during high-frequency welding, the assembled fixture is placed on the tray, and the device starts heating after sensing the product. The workpiece is evenly heated to 160°C within 20 seconds. After keeping warm for 5 seconds, the fixture is pushed into the cooling station for air cooling. The welding process is completed within 10 seconds. The next step can be started only after all temperature measuring points meet 160°C, otherwise the machine alarms and automatically returns.

7. The high frequency welding process for heat sink according to claim 1, characterized in that: In step 4, the holding force test is to use a thrust gauge to press on the heat sink and then gradually apply pressure downward. When the lateral thrust is greater than 480N, the heat sink does not fall off and the product is good.