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      公司資訊
      • 回流焊的溫測試的方法有哪些
      • 本站編輯:杭州歐海自動化設備有限公司發布日期:2018-05-17 17:47 瀏覽次數:

      回流焊爐溫測試儀的基本原理比較簡單,它對PCB板的表面貼裝元件焊盤印刷錫膏,然后通過自動貼片機把SMD貼放到預先印制好錫膏的焊盤上。比較后,通過回流焊接爐,在回流焊爐中逐漸加熱,把錫膏融化,稱為回流,接著,把PCB板冷卻,焊錫凝固,把元件和焊盤牢固地焊接到一起。

      The basic principle of reflow soldering is simple. First, it prints the solder paste on the surface of the surface mounting element of the PCB plate, and then puts the SMD on the solder paste prepared by the automatic patch machine. Finally, through the reflow soldering furnace, gradually heated in the reflow furnace, the solder paste was melted, called reflux, and then the PCB plate was cooled, the solder was solidified, and the components and pads were firmly welded together.

      要得到好的回流焊接效果必須有一個好的回流溫度曲線。那么什么是一個好的回流曲線呢?一個好的回流曲線應該是對所要焊接的PCB板上的各種表面貼裝元件都能夠達到良好的焊接,且焊點不僅具有良好的外觀品質而且有良好的內在品質的溫度曲線。

      2-1P41G43A2.jpg

      A good reflux temperature curve must be provided to achieve good reflow soldering effect. So what is a good reflux curve? A good reflux curve should be a good welding for all the surface mounting elements on the PCB plate to be welded, and the solder joints not only have good appearance quality but also have good internal quality temperature curves.

      而錫膏的特性決定回流曲線的基本特性。不同的錫膏由于助焊劑(Flux)有不同的化學組分,因此它的化學變化有不同的溫度要求,對回流溫度曲線也有不同的要求。一般錫膏供應商都能提供一個參考回流曲線,用戶可在此基礎上根據自己的產品特性或結合IPC/JEDEC J-STD-020回流爐測溫規范來優化制定出一個回流曲線標準。那么應該如何進行回流焊的爐溫測試呢?

      The characteristics of solder paste determine the basic characteristics of the reflux curve. The solder paste (Flux) has different chemical components because of different solder paste, so its chemical changes have different temperature requirements, and there are different requirements for the reflux temperature curve. Generally, the solder paste supplier can provide a reference reflux curve, and on this basis, the user can optimize the standard of a reflux curve based on its own product characteristics or the IPC/JEDEC J-STD-020 reflow furnace temperature gauge specification. How to test the temperature of reflow soldering?

      測試工具

      test tools

      1.KIC2000爐溫測試儀

      1.KIC2000 furnace temperature tester

      非實時測溫儀,通過采樣、存儲,然后將采集來的數據上載到計算機進行分析。

      Non real time thermometer, through sampling and storage, then uploads the collected data to the computer for analysis.

      2.熱電偶

      2. thermocouple

      用于感受環境溫度的介質。其工作原理是由兩種不同成分的導體組成回路,當測溫端和參比端存在溫差時回路中就會產生熱電流,通過電流的大小來反映外界溫度的變化。熱電偶一般要求較小直徑,因為小直徑的質量小,響應快,得到的結果較為準確。

      A medium used to feel the temperature of the environment. The principle of its working principle is to make up the circuit of two kinds of conductors with different components. When there is a temperature difference between the temperature measuring end and the reference end, the thermal current will be produced in the loop, and the change of the external temperature is reflected by the size of the current. The thermocouple usually requires smaller diameter, because the small diameter of the mass is small, the response is fast, and the result is more accurate.

      3.其它工具

      3. other tools

      高溫焊錫、高溫膠帶、數據傳輸線等。

      High temperature solder, high temperature adhesive tape, data transmission line and so on.

      測試點選擇原則

      Test point selection principle

      由于線路板上各個區域所承載的元器件不同,另外爐內熱空氣的流動,這樣就造成板上各處溫度也不盡相同,因此在實際測量中要真實、地反映被測產品的溫度需要選取合適的測試點。一般遵循以下幾個原則。

      Due to the different components of the circuit board and the flow of hot air in the furnace, the temperature of all parts on the board is not the same. Therefore, it is necessary to choose the suitable test point in real and comprehensive measurement of the temperature of the measured product. The following principles are generally followed.

      1.條件允許情況下盡量多地選取測試點;

      1. conditions are allowed to select test points as much as possible.

      2.被測點盡量在同一縱軸線上;

      2. the measured point is on the same longitudinal axis as far as possible.

      3.對溫度有特殊要求的元器件;

      3. components with special requirements for temperature;

      4.板面溫度比較高的位置;

      The position with the highest temperature of 4. plate surface;

      5.板面溫度比較低的位置。

      5. the lowest temperature of the plate surface.

      測試方法

      test method

      1.選取合適的測試點;

      1. select the appropriate test points;

      2.將熱電偶按照測試儀的要求固定在線路板上,并固定好。線路板選擇完全貼裝的產品。

      2. fix the thermocouple on the circuit board according to the requirements of the tester, and fix it well. The circuit board selects the fully attached product.

      3.在測試軟件中選擇錫膏并設定參數值,將測試儀與主控PC連接并打開,按照軟件上的提示完成操作。

      3. select solder paste and set the parameter value in the test software. Connect the tester to the main control PC and complete the operation according to the prompt on the software.

      4.將線路板和測試儀送入爐中進行測試,此時設定溫區溫度和預測溫度一致。

      4. the circuit board and tester are sent into the furnace for testing. At this time, the temperature of the temperature zone is consistent with the predicted temperature.

      5.待出爐后將數據線連接,傳送爐溫數據,傳送完畢后模擬出爐溫曲線。

      5. the data line will be connected and the furnace temperature data will be transmitted after the furnace is released. After the transmission is completed, the furnace temperature curve will be simulated.

      6.通過調節使各溫區溫度達到合適,而后等測試儀冷卻后再進行測試,確認無疑后生產。

      6. by adjusting the temperature to achieve the appropriate temperature zone, and then test the instrument cooling after testing, no doubt after the production.