论文部分内容阅读
螺母絲錐(如图所示)鉴于加工通孔零件的有利条件,其切削角k_r(旧标准符号为φ)值取得較小。根据标准所規定的切削部分长度l、外径d及小头直径d_x計算,k_r≈3°。GB标准及据其編制的螺紋工具生产图册則分成Ⅰ型、Ⅱ型两种,Ⅰ型k_r≈1°30′、Ⅱ型(k_r≈3°(其中Ⅰ型仅用于短柄螺母絲錐;长柄及弯柄螺母絲錐則兼有Ⅰ、Ⅱ两型)。这些标准的k_r值看来較小,加之絲錐的1又是根据螺距t而定:k_r≈1°30′
Nut Tap (shown) In view of the favorable conditions for machining through-hole parts, the cutting angle k_r (old standard symbol φ) is smaller. According to the standard cutting length l, diameter d and small head diameter d_x calculation, k_r ≈ 3 °. GB standard and its production according to the production of thread tools atlas are divided into Ⅰ type, Ⅱ type two, Ⅰ type k_r ≈ 1 ° 30 ’, Ⅱ type (k_r ≈ 3 ° (of which type Ⅰ only for short-stem nut taps; Long handle and curved handle nut taps are both Ⅰ, Ⅱ) .The k_r value of these standards appears to be small, in addition to the tap 1 is based on the pitch t may be: k_r ≈ 1 ° 30 ’