The used heating medium generator to be provided with means to normal phase / reverse phase rotating the body to be heated and allowed to boil water under pressure, it is possible to generate a mixture of steam and water or water vapor, part of the nozzle which It is a process for the manufacture of the workpiece or machining material is characterized in that the heating medium is obtained by injecting into the heating chamber of a semi-sealed state provided with the discharge path, and heating the high freshness material.被加熱体を順相/逆相回転させる手段を備えてなる加熱媒体発生装置を用い、加圧下で水を沸騰させて、水蒸気又は水蒸気と水との混合物を発生させ、これをノズルから一部排出経路を設けた準密閉状態の加熱室内に噴射することにより得られる加熱媒体によって、高鮮度素材を加熱処理することを特徴とする加工用素材または加工品の製造方法である。
