The front end of the SMD processing is stencil printer and SMT machine, the back end requires reflow soldering machine high temperature welding, the solder paste will melt the electronic components and pads tightly fixed together to prevent falling off. Reflow oven generally has 4 temperature zones, respectively, heat absorption zone, constant temperature zone, soldering zone, cooling zone, the temperature of different areas need to be different, so as to achieve excellent soldering quality, thereby improving the welding through rate, reduce the welding defect rate. Therefore SMD processing reflow soldering temperature profile control is very important
Reflow soldering temperature profile measurement temperature, you need to use the temperature profile tester. Measurement available solder, high temperature tape fixed in the test point, open the switch of the tester, temperature measurement instrument with the PCBA into the furnace cavity, according to the programming process and speed of sampling and recording the furnace temperature, test records are completed, the tester will be connected to the printer, you can print out the temperature curve graph of different temperature zones.
When using the temperature measuring instrument, there are the following methods need to be noted.
1. Measurement must be used when the board has been mounted
First of all, the thermal analysis of the PCB components, due to the different thermal properties of the PCB, the size of the components and material differences, etc., the actual heat rise at each point is not the same, to find the most hot and cold points, you can measure the highest temperature and the lowest temperature.
2. Set up more test points to detect the real heat state
For example, the center of the PCBA board and the edge of the heat is not the same, large volume components and small components with different heat capacity and heat-sensitive components parts must be set up test points.
3. Thermocouple probe shape is tiny, must be fixed in the test position with the specified high-temperature solder or adhesive, otherwise heat loosening, deviating from the intended test point, causing test errors.
1. Built-in welding fume filtration system, effective filtration of harmful gases, beautiful appearance and environmental protection, more in line with the use of high-end environment.
2. The control system has the characteristics of high integration, timely response, low failure rate, easy maintenance, etc.
3. Can store 40 working files.
4. Up to 4-way real-time display of PCB board surface welding temperature curve.
5. lightweight, miniaturization, professional industrial design, flexible application scenarios, more humane.
6. Unique heating plate design effectively ensures uniform cooling after the equipment stops heating, effectively preventing the parts from being damaged by the rapid decrease in temperature and the resulting deformation.
7. Concealed screen design is convenient for transportation, easy to use, beautiful and generous.
8. the control system uses imported chips, temperature control accuracy of ± 0.5%.
