SMT power inductor core magnet sleeve and base separation phenomenon-Shenzhen Leixingyang Industrial Co., Ltd.

1.SMT power inductor core magnetic sleeve and base separation phenomenon cause analysis: the assembly of defective products to confirm the appearance, the assembly of this abnormal for the bottom of the inductor core and BASE joints due to my Division of this combination of glue for the whole version of the brush glue, BASE bottom circular groove size is too deep, the same area of the combination of the glue brushed under the pressure of the iron core and BASE, the glue failed to spread evenly throughout the entire iron core bottom, the adhesive force is insufficient, coupled with the products of the combination of magnetic sleeve dispensing glue amount is too small, too high temperature on the client's board, resulting in inductors ceramic sleeve and the separation of the BASE, warped defective.

2. For the inductor core magnetic sleeve and base separation of the solution countermeasures, one: for SMD power inductors this product will be product brush glue mesh thickness increased from the previous 1.0mm to 1.5mm, the area of unchanged under the circumstances of the increase in the thickness of the brush glue, the product core and the base combination of compression, so that the amount of glue between the two to reach the entire core and base contact area, to ensure that the size of the jointing force, and the other: the combination of the provisions of the amount of glue, to make clear that the glue area needs to cover more than 1/2 of the contact surface with the base. Clearly the glue area needs to cover more than 1/2 of the contact surface of the magnetic sleeve outside and the base.
Confirmation of the effect: A. According to the implementation of long-term improvement measures, quality supervision daily to do external inspection after the appearance of the braided tape bad statistics, recorded by the quality of the daily sampling record sheet. b. Strict implementation of operating standards, adhesion and combination of dispensing volume to ensure that the entire magnetic sleeve outside the base of the contact surface of the more than 1/2 to the new appearance standards made and tested 300pcs of finished products, simulation of the client IR-Reflow temperature curve over the furnace test to confirm that no inductive products core magnet sleeve and base separation defective, improve OK. Simulate the client's IR-Reflow temperature curve over the furnace test to confirm that no inductor products core magnet sleeve and base separation defective, improve OK.