FORMING METHOD OF LIQUID STORING PART OR LIQUID PASSAGE OF RESINOUS CELL AND BORING BAR

摘要

PROBLEM TO BE SOLVED: To provide a method for simply forming a liquid storing part or a liquid passage of a resinous cell without forming a joint by welding, adhesion or the like having the possibility of liquid leakage, and a boring bar used therefor. SOLUTION: This forming method of the liquid storing part 18 or the liquid passage 1 of the resinous cell A comprises (a) a process for heating at least the head of the boring bar 10 and its periphery, and (b) a process for thrusting the head of the boring bar 10 into resinous cell material B to melt and bore the resinous cell material B.