中龙集团
Dragon Group China Limited
BIRD
®
ceramic heater can't cool down very quickly, thus it is difficult to control the time of
higher reflow temperature. However, the convection can control strictly, and it is
conductive to a better & repeatable temperature curve, and the components will not be
over-heated, and the time of higher reflow temperature will not prolong too much.
The standard reflow consists of 3 temperature areas: preheating area, insulation area
and reflow area. After reflow, it is the process that PCB cools down to less than 100. The
soldering
℃
process is more important in lead-free assembly. Lead-free process calls for
temperature as high as 235, but BGA/CSP is sensitive to high temperature. Then the
wrong temperature rising will burn the components.
Semi-auto reflow retrieval system can save many temperature curves. It is important
to know the use of temperature curves.
An precise temperature is the key point in the
production which can ensure that all the welding points heat and reach the peak
temperature together. The starting point of the production parameter is the actual
temperature of PCB. The technician can adjust the heating area parameter of the
machine to achieve the expected temperature curve of PCB through the analysis of
material temperature.
The convection rework station which can save many temperature curves is directed by the
approximate situation of PCB heating. The more precise method is to connect a K sensor to the
PCB to detect the temperature. What
’
s more, the final form of process control is to detect the
welding points in the process, or to detect the reflow points. Look at the following picture:
Infrared reflow oven and repair sets are not new to the world. However, because the
Summary of Contents for Bird AC-5K
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