Reshape - Realign

Japanese: 形直し - かたなおし

...Recent grinding processes have focused on developing technology that further improves processing efficiency while maintaining the high processing accuracy that is characteristic of grinding, and advances in grinding machines and grinding fluids have made it possible to achieve a mirror finish with a surface roughness (maximum height) of 0.02 μm, roundness of 0.4 μm, and cylindricity of 1 μm/500 mm.
[Reshape and stitching]
Before grinding, the grinding wheel must be adjusted so that it can cut normally by a process called reshaping and sharpening. Reshaping involves grinding the outer circumference of the wheel to give it the correct cylindrical shape and removing any eccentricity in the wheel, while sharpening involves straightening out any irregularities in the abrasive cutting edges and removing any dull or clogged cutting edges to restore the wheel's sharpness.

From [Grinding wheel (grinding stone)]

...If the selection is not correct, problems such as blunting (the cutting edges of the abrasive grains becoming worn down and flattened), clogging (the pores of the grinding wheel being clogged with cutting debris), and over-cutting (excessive grains falling off) can occur. When using a grinding wheel, it is necessary to reshape (the operation of finishing the circumference of the wheel to the correct geometric shape with a suitable tool), and dress or sharpen (the operation of producing a sharp cutting edge on the wheel surface with a suitable tool).
[Application]
According to the type of abrasive, A wheels have a high tensile strength (30kgf/mm2 or more) and are used for rough grinding of tough, relatively sticky work materials, while WA wheels have an extremely high tensile strength (50kgf/mm2 or more) and are used for precision grinding of tough, dense work materials that often generate heat during grinding.

*Some of the terminology explanations that refer to "reshaping" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…　最近の研削による加工は，研削の特徴である高い加工精度を維持しながら，さらに加工能率を高める技術の開発に重点が置かれており，研削盤と研削液の進歩によって，加工精度は表面粗さ(最大高さ)0.02μm，真円度0.4μm，円筒度1μm/500mmの鏡面仕上げができるようになっている。研削盤
［形直しと目直し］
　研削を行う前には，研削といしを形直しと目立てと呼ばれる作業によって正常に切削が行えるように調整しておかなければならない。形直しは，といしを正しい円筒形状にするためといし外周を削り，といしの偏心を取り除く作業であり，目立ては，砥粒切れ刃のふぞろいを整えたり，目つぶれ，目づまりを起こした切れ刃を除去して劣化した切れ味を回復する作業である。…

【研削といし(研削砥石)】より

…選択が適正でないと，目つぶれ(砥粒切れ刃が摩滅して平たんになること)，目づまり(といしの気孔中に切りくずなどがつまること)，目こぼれ(砥粒が過度に脱落する現象)などのトラブルが生じる。研削といしの使用にあたっては，形直し(適当な工具でといし外周を正しい幾何学的形状に仕上げる操作)，目直しまたは目立て(適当な工具でといし表面に鋭い切れ刃を出現させること)を行う。
［用途］
　砥粒によって分けると，Aといしは引張強さが高くて(30kgf/mm2以上)強靱な比較的粘りのある被削材とか粗加工に，WAといしは引張強さがすこぶる高くて(50kgf/mm2以上)強靱堅密で研削熱を発生することの多い被削材とか精密研削に用いられる。…

※「形直し」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典第２版について | 情報

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