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发明申请
US20080314109A1 Plug for use in piercing mill 有权
插头用于穿孔机

Plug for use in piercing mill
摘要：
A plug has a tip end portion, a taper portion, and a middle portion. The surface of the tip end portion is a spherical surface whose radius of curvature is R1 and length is L1 that is shorter than R1. The outer diameter of the taper portion on the front end side is D1, and the outer diameter on the back end side is D2 that is larger than D1, and the length is L2. The plug satisfies Expression (1), Expression (2) if 0
摘要（中）：

插头具有尖端部分，锥形部分和中间部分。 前端部的表面是曲率半径为R1，长度为L1的比R1短的球面。 前端侧的锥形部的外径为D1，后端侧的外径为D2，D1的长度为L2。 如果0 0.5D1 <？in-line-formula description =“In-line Formulas”end =“lead”？> 1.0 ？in-line-formula description =“In-line Formulas”end =“tail”？>

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