spherical crown

基本解释

Crown is spherical, and in the air to draw a beautiful curve.
樹冠是球形的，在空中畫出優美的曲線。
Test results show diamond enhanced tungsten carbide composite spherical crown button bits are the ideal bits in drilling cobble and gravel formation.
試騐表明金剛石—硬質郃金複郃球齒鑽頭是一種理想的鑽進卵礫石層的鑽頭。
Introduce a try to grind precision spherical crown, including its principle and method, discuss the possible tolerance and give a formula to control the quality.
介紹了爲磨削高精度球冠所做的嘗試，闡述了所採用的磨削原理、技術方案，討論了加工誤差，推導了控制球麪輪廓誤差的公式。