LIQUID INJECTION HEAD

摘要

An object is to provide a fine forging method for forming partitions of recesses precisely and forming recess shapes for pressure generation chambers etc. with high accuracy as well as a liquid ejection head etc. that is produced by using the fine forming method. A fine forging method for forming groove-shaped recesses 33 that are arranged at a prescribed pitch. After groove-shaped recesses 33 are formed tentatively in a material plate 55 by a first punch 51a in which tentative forming punches 51b are arranged, finish forming is performed on the tentatively formed groove-shaped recesses 33 by using a second punch 51c in which finish forming punches 51d are arranged. An end portion of a projection strip 53c or 53d is formed with slant faces 63 and 64 or a slant face 65, whereby an end portion of each groove-shaped recess 33 is formed precisely. A liquid ejection head 1 produced by the above method exhibits stable liquid ejection characteristics and its manufacturing cost can be reduced by virtue of simplified working of forging.