Hardware Development Guide of Module Product
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81
MF206A
10.2
Furnace Temperature Curve
The furnace temperature curve greatly affects the wielding quality and the material status, so it needs to be paid
great attention to. The temperature increasing speed cannot be too fast, with the increase speed from the room
temperature to 150
℃
less than 3
℃
/second. At the same time, if the temperature is above 217
℃
, the duration
should be kept within 70 seconds, while the interim value 55 seconds is ideal. Otherwise, the great temperature
shock will make certain devices ineffective, causing the quality to decrease and the maintenance difficulty to
increase. At the same, keep the precise maximum temperature to be below 245
℃
, as certain materials (such as
the crystal) might crack under the high temperature and won’t vibrate any more, so the product function is
affected. Refer to Table 10-1 for the detailed requirements setting of furnace temperature curve, refer to Figure
10-2 for the furnace temperature curve and the testing result.
Table 10–1 Curve Temperature Curve Parameter Setting
Lead-free Curve Temperature Curve
Phase
Temperature
Duration
Pre-heat
Temperature is
increased from room
temperature to 150
℃
Temperature
increasing ratio
<3
℃
/second
Temperature keeping
150
℃
~200
℃
40~110 seconds
Wielding
Greater than 217
℃
40~70 seconds
Above 230
℃
15~45 seconds
Peak temperature
MAX: 245
℃
MIN: 230
℃