Patent ID: 9221153
Filing Date: 2015-12-29
Classification: B22F,B24D,C22C

Abstract:
1. A method for preparing a sintered metal matrix diamond saw blade utilized for cutting a QFN packaging device, comprising following steps of: (1) component designing and preparing, comprising: forming the sintered metal matrix diamond saw blade utilized for cutting the QFN packaging device with metal matrix and diamond grains, wherein the metal matrix comprises metal powder and ultrafine inorganic filler, disposing the metal powder and the ultrafine inorganic filler into a mixer to process wet-mixing and stirring for 3-5 hours, then adding the diamond grains which are treated by screening for contaminant release, and stirring for 2-3 hours to obtain a mixed material which has uniform composition and evenly distributed diamond grains; (2) cold pressing for pre-shaping, comprising: distributing said mixed material in a steel mould, then pressing in a press machine to manufacture a shaped compact, disposing samples thereof into a graphite mould; (3) hot-pressing sintering, comprising: shifting the graphite mould and the shaped compact thereof as a whole body into a sintering furnace to process hot-pressing sintering, in such a manner that a sintered metal matrix diamond saw blade blank is manufactured; and (4) machine-shaping, comprising: cutting an inner hole and an outer circle on the saw blade blank via a slow-feeding wire-cut machine after de-burring the saw blade blank, processing thickness reduction by a double-sided free grinding technique to obtain an ultrathin saw blade meeting thickness requirements; wherein the step of cold pressing the mixed material which has the uniform composition and the evenly distributed diamond grains in the steel mould is under following processing conditions of: pressure of 50-75 MPa and pressure holding time of 2-3 s.