PROBLEM TO BE SOLVED: To provide a mortar body and mill device easily finely grinding the grinding objects and capable of performing grinding processing with excellent uniformity in grain-size distribution by just providing a groove of a mill blade with a simple structure.SOLUTION: A mortar body 62 to which the present invention is applied, includes: a disk-like mortar body 33 in which a shaft hole 35 located on a drive shaft 3 of a tea mill 1 is formed at a substantially center thereof； a rough blade 38 in which groove-shaped main groove parts 51-54 located on main helical lines 41-44 that circulate the periphery of the shaft hole 35 from the shaft hole 35 towards a peripheral edge part, are formed on a grinding surface 33a of the mortar body 33； a narrow blade 39 in which a groove-shaped sub groove part 55a located on a sub helical line 45 circulating on the grinding surface 33a so as to intersect with the main spiral lines 41-44 in a same direction is formed between the main groove parts 51-54 or on a main crest part 55 located at an adjacent position thereof； and a mill part 34 formed by including a weir structure on the main groove parts 51-54 so as to change a flowing direction of powdered tea 14 in mid-flow of the power tea 14 flowing therein during grinding.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2018,JPO&INPIT【課題】ミル刃の溝内に簡単な構造を設けるだけで、被粉砕物の細粒化が容易で、粒度分布の均一性にも優れた粉砕処理が可能な臼体及びミル装置の提供を目的とする。【解決手段】本発明を適用した臼体６２は、お茶ミル１の駆動軸３上に位置する軸孔３５が略中央に形成された円盤状の臼本体部３３と、臼本体部３３の臼挽き面３３ａ上で、軸孔３５から周縁部に向かって軸孔３５周りを周回する主渦巻き線４１～４４上に位置する溝状の主溝部５１～５４が形成される粗刃３８、及び臼挽き面３３ａ上で、主渦巻き線４１～４４と同方向にて交差するように周回する副渦巻き線４５上に位置する溝状の副溝部５５ａが、主溝部５１～５４間またはその隣接位置にある主山部５５に形成される細刃３９を有し、主溝部５１～５４に、臼挽き中にその内を流れる粉末茶１４の流動途中で粉末茶１４の流動方向を変更可能な堰構造を設けて成るミル部３４とを備えたものである【選択図】図３
