段削りによる軸受鋼材の内外の地疵変化について
非金属介在物の研究-II
1958 年 44 巻 7 号 p. 740-743
詳細
1958 年 44 巻 7 号 p. 740-743
Synopsis:
In the present investigation, the authers have compared the number of sand marks of steel rod, steel pipe, from the same change, and extruded rod from another change.
The results are briefly summarized as follows:
(1) By the means of gradual cutting of steel rods, the total number of sand marks at any surface is almost equal, yet, many larger sand marks exist on the periphery of steel rod, but larger sand marks exit rarely at the center.
(2) Sand marks are elongated by the rolling of steel rods.
(3) Sand marks do not vanish by severe hot working, such as piping or extrusion.
